I’m having a similar problem and hope you can help. I did a clean windows 7 install in Nov 2016 and then installed then current AxCrypt 2.1.1389.0. At first I was able to open old AxCrypt files using the login, but today I get the message “File encryption for .NET and Mono has stopped” It goes on to say Windows will give me a solution when one is found.
I’ve searched for both Lavasoft and Web Companion and didn’t find either. I haven’t found the switch for running off-line, and disconnecting from the internet results in a password error (!).
I have numerous AxCrypt encrypted files that I need access to. Hope you can help!