I have installed axcrypt on windows 10 but have an unhandled exception “the path is not of a legal form” I don’t know what this means nor how to proceed. I have tried uninstalling and re-installing but get the same error.
The message you spoke about is a generic C# error but as long as it’s gone away then there is no problem.
Microsoft have today released a number of critical security patches and general updates, one of which is the Microsoft .NET Framework 4.7. It may have been that you failed to restart after installing/updating to the latest version of AxCrypt and the .NET service had been terminated by the Windows Server Update Services.