VersaTune User Forum

Hello,

I am having difficulty updating software and ECU definitions. I am receiving the following error:

"Could not load file or assembly 'System.Security.Principal.Windows, Version=4.1.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified."

Please assist.

Probably it passed more than 1 year since your last update.
Log into your account at versatuner.com, go to Versatuner -> Licenses and Downloads -> Versatuner Downloads, download Versatuner run that file to perform update. See if that works, it should. Once you do that you should be able to download the latest ECU definitions from now on.