Hello Pavel Tsvetkov ,

I believe this might be originating from an earlier plugin that's not been updated and may be causing the conflict with the updated version of Studio.

As always, it's recommended to post the full stack trace that should provide us with useful information.

In the meantime, I would suggest removing the plugins from the following folders 

c:\Users\[USERNAME]\AppData\Roaming\SDL\SDL Trados Studio\15\Plugins\Packages\

c:\Users\[USERNAME]\AppData\Roaming\SDL\SDL Trados Studio\15\Plugins\Unpacked\

c:\Users\[USERNAME]\AppData\Local\SDL\SDL Trados Studio\15\Plugins\Packages\

c:\Users\[USERNAME]\AppData\Local\SDL\SDL Trados Studio\15\Plugins\Unpacked\

c:\ProgramData\SDL\SDL Trados Studio\15\Plugins\Packages\

c:\ProgramData\SDL\SDL Trados Studio\15\Plugins\Unpacked\

Also make sure there is no evidence of it in here:

c:\Users\[USERNAME]\AppData\Roaming\SDL Community\

Then restart Studio.

If Studio now starts without issue, please install the latest AppNotifications plugin 

https://appstore.sdl.com/language/app/appnotifications/1020/

This way you will always be notified of the updated plugins.

Of course, you can then reinstall the plugins.

Please let me know if this helps.

Hi Steven,

Thank you for your message.

1. Manually deleting the plugins worked! Thank you for a great suggestion!

2. Some of these plugins provide important services that are otherwise missing in Studio, but plugins also cause a lot of issues.

3. The system in place of having to download separate plugins to do things, and then invariably run into critical compatibility issues when you least expect it, seems to be inherently flawed. SDL must do better than this!

Best regards,

Pavel Tsvetkov

Hi Steven,

Thank you for your message.

1. Manually deleting the plugins worked! Thank you for a great suggestion!

2. Some of these plugins provide important services that are otherwise missing in Studio, but plugins also cause a lot of issues.

3. The system in place of having to download separate plugins to do things, and then invariably run into critical compatibility issues when you least expect it, seems to be inherently flawed. SDL must do better than this!

Best regards,

Pavel Tsvetkov

Pavel Tsvetkov said:

3. The system in place of having to download separate plugins to do things, and then invariably run into critical compatibility issues when you least expect it, seems to be inherently flawed. SDL must do better than this!

I completely agree... Trados 2021 has a much improved mechanism for this as the appstore is very well integrated into the product.  You will always know if there is an update for you and updating is a single click.

If you installed the app notifications plugin it would help as this at least gives you an idea of when a new version is available.