Several people, including myself, report an error. After installation of TB, MS Visual C++ will be installed. This has been standard for some time.
Now at the end of that installation, you may get an error:
"Error in executing ....\TheocBase\vcredist_x64.exe /install/passive/norestart: Program ended with an error exit code"
Just before that message you get an explanation in your OS language that says 'Problem in executing post installation step. Installation may not be completed properly', or something of that kind. The thing is that in some languages the message seems to imply installation failed, and in others that it just might have failed (which means it might have succeeded as well).
Suggestion: OK the error, and see if you can start and use TB all right. Some have reported that they encountered no problems at all after ignoring this message.
If TB does not work (except for the splash screen only issue, see release notes for that one) you may have to find additional info on this forum (which is there).
For accessing the database my personal preference is http://sqlitebrowser.org/
For editing templates I now use https://code.visualstudio.com/