Cannot start Studio 2021 after installing SR2 Update: Error: Failed to add window command bar extensions

I just updated my Studio 2021 to SR2. After getting a message of successful installation, now I cannot even open the program. When I try, I get the error message: "Failed to add window command bar extensions."

I have the latest update of Windows 10 running.

I could not try the solution of uninstalling the plug-ins because I cannot even start the application.

And I could not try the solution below, because I cannot find the folder mentioned in step 2.

1. Close SDL Trados Studio.
2. Go to C:\Users\%USERNAME\%AppData\Roaming\SDL\Platform\Identity\SDLTradosStudio.exe. and rename the folder SdlIdentityCredentials into SdlIdentityCredentials_old.
3. Restart 
SDL Trados Studio.

Any suggestions?

Thanks in advance,

Eduardo Berinstein