Frequently asked questions

Frequently Asked Questions

Most problems can be solved by downloading and installing the latest Lethal synth installer from your account.

Latest version: Lethal 1.0.29

If you are still experiencing issues after trying the solutions listed in our FAQ, please contact us at [email protected].

What are the minimum system requirements for Lethal?


Pentium 2.0 GHz processor or equivalent or better

4GB RAM or more

1024 x 768 display or higher

Windows 7*/8*/8.1*/10+

5GB disk space – more for expansion packs

* Windows 7 & 8 support is not supported, however we will try solve any issues that a user may come across.



Lethal is compatible with the following systems:


Intel / Silicon (M1)

Apple M2

MacOS 13 (Ventura)

MacOS 12 (Monterey)

MacOS 11 (Big Sur)

MacOS 10.15 (Catalina)

MacOS 10.14 (Mojave): No current issues but no continued support

MacOS 10.13 (High Sierra): No current issues but no continued support

MacOS 10.12 (Sierra): No current issues but no continued support

OSX 10.9 (Mavericks) – OSX 10.11 (El Capitan): No current issues but no continued support

4GB RAM or more

1024 x 768 display or higher

5GB disk space – more for expansion packs

Note: Internet connection is recommended method for activation – offline activation available.

What host DAW software is Lethal compatible with?

Lethal is generally compatible with any DAW that accepts VST, AU or AAX, including, but not limited to:

Ableton Live

Acoustica Mixcraft

Apple Logic Pro X

Cakewalk Sonar 8 or above

Image-Line FL Studio

Presonus Studio One 2 or above

Pro Tools 11 or above


Steinberg Cubase

How is Lethal delivered?

Lethal is delivered to you digitally over the internet as a download. Your installation files are available to you instantly for download within your account.

Can I purchase a hard copy or boxed version of Lethal?

Lethal is only available for purchase online as a digital download.

What formats are Lethal available in?


VST3 (32/64 BIT)

AAX (32/64 BIT)


VST3 (64 BIT)

AU (32/64 BIT)

AAX (32/64 BIT)

Where do I find my license key?

Your license key can be found in your account.

Where do I download the installers/expansions?

All purchased downloads can be found in your account.

How do I install Lethal, Core Library & Expansions?

Once you have downloaded the installers for either PC/MAC from your account, follow these steps:


Make sure to unzip all files before running *.msi installer.

Install Lethal by double clicking the *.msi installer and following the prompts.

Install Libraries by running the *.msi application.

You may choose to install your Core Library & expansions on a different drive if so desired. Please make sure to create a new directory for each library (you cannot install all libraries into one single directory, as there will be loading errors with sounds. Using Lethal’s generic directory naming is preferred)

On first run, you will be required to enter your license key, which is found within your account on our site.



Install Lethal by Command + Click, or right clicking the *.pkg installer, then click “Open”.

Click open and follow the prompts.

Install the Core Library & Expansions the same way.

You may choose to install your Core Library & expansions on a different drive if so desired. Please make sure to create a new directory for each library (you cannot install all libraries into one single directory, as there will be loading errors with sounds. Using Lethal’s generic directory naming is preferred)


On first run, you will be required to enter your license key, which is found within your account on our site.

How do I activate Lethal?

Be sure to have an active internet connection.

Once you open Lethal in your host DAW software for the first time, you will be prompted to enter your license key. Copy and paste your license key (as shown in your account on our site) or type it in manually, then press OK.

On some DAWs, you may be prompted to enter your license key during the host DAW’s start up scan of new plugins.

For situations where offline activation is required, select the offline selection when activating and send us the generated file. We will send back a response file for your machine.

How do I deactivate Lethal?

To deactivate Lethal, simply click the ‘deactivate’ button located in the System menu tab within Lethal.

To erase license key from system, make sure the box is checked ‘Erase existing license key’, and click OK.

If for some reason the ‘deactivate’ button is greyed out, simply select and load any preset from the Library then try again.


You can manage activated systems from within your account, or for any further assistance contact support.

Expansions / libraries are not loading. Product not resolved error.

When installing libraries while Lethal is open, you may come across a load error when selecting sounds.

This issue can be easily solved by deactivating Lethal and reactivating.

Please follow these steps:

1. Make sure to update to the latest Lethal synth installer from your account.

2. Select ‘System’ in Lethal.

3. Click ‘Deactivate’, and also make sure to tick the box that says ‘Erase existing product key’.

4. Click Yes.

5. Close Lethal. Reopen and enter license key.

The libraries will now be activated.

You can also manage/remove activations within your account. .

How many computers can I install Lethal on?

A single Lethal license is licensed for one user. Two (2) activations are available to each user.

If you would like to run Lethal on more than two computers you can purchase additional licenses by contacting [email protected].

Note: Lethal requires an internet connection for activation.

Can I transfer my license to a new user?

Yes, we allow you to transfer your license to a new user.

Send us an email for a transfer request to [email protected] using your registered email address and also providing the new users full name and email address.

I'm currently installing, and the installation appears frozen while initially verifying, or is taking a long time to process.

The installation may only appears frozen but it is most definitely processing. Please allow up to 5 minutes for it to complete verifying. For any install issues please contact us at [email protected].

Why is there no sound coming out of Lethal?

There could be a number of issues with this problem, including (but not limited to):

  • Lethal may not be activated properly. Try closing and reopening your host DAW, then load Lethal again and enter your serial number if prompted.
  • You may not have the appropriate channel in your DAW properly armed for use with your midi keyboard. (Check with your host DAW’s manual).
  • You may not have the appropriate audio driver selected in your host DAW’s audio settings.
  • Your audio cabling chain may be incorrect.
  • Your audio interface may require a firmware update.
  • Your host DAW may be incompatible or too old (highly unlikely).

If the problem persists, please email us at [email protected]. We will do our very best to help you solve the problem.

Is Lethal a hardware synthesizer?

Lethal is not a hardware synthesizer. It is an extremely powerful software plugin, coded upon rom-based technology similar to how some hardware synthesizers work.

The image shown on the homepage of our site is an artist’s 3D render model only.

How do I get the best CPU performance?

If applicable, make sure CPU multi-threading options are enabled within your host DAW’s settings.

Increase your sample buffer within your host DAW’s audio settings.

My question isn’t answered here or I’m having technical difficulties with Lethal.

We love to help our customers. Please email us at [email protected], and we will respond as soon as possible. We are always happy to help!

Slow load time in DAW

On some systems, you may experience longer load times when loading instances of Lethal in your DAW.

This can be solved by downloading and installing the latest version of Lethal, available from your account.

Activation failed.

Take a screen shot of the error and email it to [email protected], along with your system specs.

Activation failed. Connection to the server failed

First thing to check is that you have downloaded and installed the latest Lethal installer, and have an active internet connection. Retry activating.

If you are using Windows, and have an active internet connection, then it is most probably a network adapter issue. It is likely there are network adapters on your system that are disabled.

To make sure they are enabled:
Go to Network Connections.

Search ‘Network Connections’ at search bar and click ‘View network connections’.

Right click on each adapter and click ‘Enable’

If this still doesn’t work, there are other ways that our support team can run through with you. Please contact us at [email protected] with the subject ‘Activation Failed’, and we will help you get it working!

Activation failed: The product key has already been activated with the maximum number of computers

You can manage activations / deactivations from your account.

Moving Lethal libraries to a new location - PC

Contact [email protected] for assistance.

Moving Lethal libraries to a new location - MAC

Some users find it easier to copy and paste libraries to a new location. This saves the user from installing each library one by one, which can potentially be time consuming.

In order for this to work, Lethal needs to point to the right path.

The easiest way is to send us the lethal *.plist file, along with a screenshot of the directory tree where your libraries are located. We need the exact full names of the volume, and directories, so a full screen shot of the finder window is preferred to send us.

The *.plist file is located at: Macintosh HD (Root directory)/Library/Preferences/. Look for the file “com.lethalaudio.Lethal.plist“.

We will then modify it and send it back to you to replace.

You can modify the plist file yourself, simply load a plist editor and adjust the paths to the new location of the libraries. Save the plist file and replace the new one with the old one.

Removing Demo Library (and other Libraries) from Mac

We recommend backing up the “/Library/Preferences/com.lethalaudio.Lethal.plist” file first.

Located at: /Library/Preferences/



Open Terminal.

(Located at Applications/Utilities/, or Launchpad -> Other, or use the keyboard shortcut Command + Space to bring up Spotlight search, and type Terminal)



In Terminal, type: defaults read /Library/Preferences/com.lethalaudio.Lethal.plist

Press Return/Enter.



Type: sudo defaults delete /Library/Preferences/com.lethalaudio.Lethal “Demo Library

(In this example, the library we are removing is the Demo Library. Type the exact name inside the ” “of the library you wish to remove that is shown in the list on Step 2)

((If you wish to remove other libraries, simply replace ‘Demo Library’ with any other library names listed))



Delete the “/Library/Application Support/Lethal/Demo Library” folder.


Should you require further assistance, please contact us at [email protected].

Error Codes

If you receive an error code, most of the time it can be solved here. For error codes not listed, or if the issue hasn’t been resolved, please send us the error code to [email protected].


ERROR CODE 4 – Connection to server has failed. You are on a non-networked machine, or the system has blocked the DAW (and thus Lethal) from the network. You will need an internet connection to activate Lethal first time running. Open/enabled networking and then activate your license.



ERROR CODE 5 – Product has been activated with the maximum number of computers. Contact us at [email protected] so we can remove system activations for you.



ERROR CODE 6 – Product key revoked. Please contact us at [email protected].



ERROR CODE 28 – There are network adapters on the system that are disabled. Enable network adapters and re-try activation.