Follow these simple steps to download, register, and install CotranslatorAI on your computer:

Step 1: Get CotranslatorAI

A. Download CotranslatorAI

Download the CotranslatorAI 64-bit version for Windows from the link/button below:

This is a 64-bit version of the program designed for a 64-bit Windows version. If you use a 32-bit version of Windows, please contact us at, and we will provide a 32-bit version.

B. Install CotranslatorAI

Follow these steps to install CotranslatorAI:

  1. Install CotranslatorAI using the installation program. The installation program does not require administrator rights for installation, so you must be logged in using your personal Windows user account that you use for your work.
  2. Read and accept the license agreement.
  3. On the next page of the installation program, choose the location for the CotranslatorAI program and data files. By default, CotranslatorAI is installed to the Documents folder of the current Windows user (C:\Users\username\Documents\CotranslatorAI). We recommend that you install in the default folder. However, you can change this location to another folder (e.g. C:\Users\username\CotranslatorAI). If you decide to install the program in a folder outside your user folder (C:\Users\username\), please make sure that this folder can be written to when you use CotranslatorAI. This is necessary for updating prompt files and configuration files located in the CotranslatorAI program folder.
  4. On the next page of the installation program, click the Install button.
  5. CotranslatorAI requires .NET Desktop Runtime v.6 from Microsoft. If this runtime is not yet installed on your computer, the installation program will automatically download the installation file for .NET Desktop Runtime v.6, so an internet connection is required. When the downloading completes, .NET Desktop Runtime v.6 installation program will be run. Follow the prompts to install it. When installation completes, CotranslatorAI’s installation program will resume and complete the installation process.
  6. On the last page of the installation program, you will be prompted to launch CotranslatorAI. You can check the box to run it immediately, or select CotranslatorAI from the Windows start menu later.
  7. In addition to the main CotranslatorAI application, the installation program also installs the CotranslatorAI Companion application. This is a small application responsible for processing keyboard shortcuts in order to run your keyboard shortcuts assigned to prompts in the prompt library and which also enables you to use the keyboard shortcuts assigned to built-in commands in order to use CotranslatorAI more efficiently. CotranslatorAI Companion is configured to start every time Windows starts up and is automatically started after installation. CotranslatorAI Companion can be accessed from the Windows system tray (indicated by the up” arrow in the task panel next to the system clock, in the bottom right corner of the screen). More information about CotranslatorAI Companion can be found in the User Guide.

Step 2: Get and enter your CotranslatorAI registration code

A. Register CotranslatorAI

Fill out the registration form below to receive your CotranslatorAI registration code and subscribe to our email communications.

CotranslatorAI Registration Form

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CotranslatorAI Registration Form

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Please select the Email checkbox below so we can email you your personal registration code and put you on our email list for updates on CotranslatorAI and other tips on using AI in your work.

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B. Get your CotranslatorAI registration code

After filling out the form above, you will receive an email to confirm your email address. Click the confirmation link and prove that you are human. You will then receive another email containing your CotranslatorAI registration code within 5-10 minutes. If you don’t see the email, be sure to check your spam folder!

C. Enter your CotranslatorAI registration code in CotranslatorAI

  1. Launch CotranslatorAI and activate it by clicking I have a registration code button. (If you did not complete the registration process in Step 2A above, click the Register for free button to do so.)
    Register for free
  2. Enter your CotranslatorAI registration code. You may use this CotranslatorAI registration code on all of your devices. In a corporate environment, please ensure that each employee receives a separate code.
  3. Click the Register button.
  4. You will now be prompted to change the OpenAI API key in the CotranslatorAI configuration dialogue.

    You can click the Yes button to open the Configuration Dialogue window so that it will be ready for you in Step 3. Or you can click the No button to close out and then proceed immediately with Step 3 anyway, or come back to Step 3 later.

Step 3: Get and enter your OpenAI API key

A. Set up a developer account with OpenAI

To use CotranslatorAI, you will need an OpenAI API key. To obtain this key, you need to create a so-called “developer” account on the OpenAI platform at (IMPORTANT: This is not the same as a ChatGPT/ChatGPT+ account which you would set up at!) Create your developer account by clicking the Sign up link. After you sign up, you will be given a small balance of free credit that can be used during a short trial period (three months at the time of writing). After the trial period ends or the free credit is used up, you will need to provide your credit card details in your OpenAI developer account in the menu under your username at the top-right of the screen (Billing > Payment Methods). To avoid this hassle later, you can also enter your credit card details now, and even set up usage limits to control your costs.

B. Enter your OpenAI key in the CotranslatorAI configuration dialogue

  1. To get an OpenAI API key from your account on the OpenAI platform (, click your username at the top-right of the screen and select the View API Keys menu item.
  2. Click the Create new secret key button and a panel will be displayed asking for a name for your OpenAI API key (referred to on this panel as a “secret key”). You can assign a name to the new OpenAI API key if you wish (it is optional) and then click the Create secret key button on the panel. A new OpenAI API key will be generated for you.
  3. Click the button next to the OpenAI API key (the graphic in the button looks like two overlapping boxes) to copy it to the clipboard. Note that the OpenAI API key will no longer be accessible once you click the Done button, and the shortened OpenAI API keys which you see in the list of keys may not be used again. However, if you forget to copy the full OpenAI API key before closing this panel, if you you lose an OpenAI API key, or just wish to change your OpenAI API key, you can always generate a new one on this page. Also, if you think that your OpenAI API key could be or could have been seen by someone else, you can disable it by clicking the trash icon next to the OpenAI API key and then creating a new one and copying it to CotranslatorAI.
  4. Now that you have your OpenAI API key, go to the configuration dialogue that you opened at the end of Step 2, or open it now in CotranslatorAI from the Tools > Options menu.
  5. Select the OpenAI API tab, click the Update button, paste your OpenAI API key from the clipboard and click OK.
  6. In future versions, the OpenAI API key will be encrypted. But for now it is available as plain text, so make sure not to share your CotranslatorAI configuration file with others.

Now you are all set to use CotranslatorAI!