I just downloaded & installed version 1.6.400.65 of BoxCryptor Classic. There is a very confusing dialog box that you WILL WANT to fix. It says that BoxCryptor Classic is going to be uninstalled, and IF THE USER WANTS TO CONTINUE USING BOXCRYPTOR CLASSIC he will need to install another program. But this IS BoxCryptor Classic!
I assume this mistaken warning is there because you adapted the installation routine from that of the New BoxCryptor program and forgot to modify it.