I'm sorry about the issues.
Please note that my included support only covers the latest active release. I don't include Tech support for older releases.
I can tell that you have mixed files in your installation. The error id was introduced in 3.20 but you are loading a previous integrity check. The software won't work as expected if you temper it.
If you use V3.20 I will be happy to assist you to get it going. Feel free to open a new ticket.