please find the fixed scripts attached. Let me address other questions you had ...
1) comparing to the existing contents of that folder
at "/MonoX/Installer/SQL/import" subfolder, "CalendarEventEntry.sql" is missing
at "/MonoX/Installer/SQL/" the "UpdateScripts" subfolder is missing (guess that's normal)
at "/MonoX/Installer/SQL" the files "DatabaseExists.sql", "DropDatabase.sql" and "TableExists.sql" are missing
CalendarEventEntry should be in the attached scripts, UpdateScripts are not deployed with this script package, DatabaseExists.sql, DropDatabase.sql and TableExists.sql
have not been changed.
2) speaking of database, are there any plans to support other databases
Yes we plan to support other databases but not in the 4.7 (Bug fix version) nor in 5.0 (HTML5 support with a lot of new social modules) but in 6.0 that will be something totally new.
A) there's an issue with the default button at the installer, it's Cancel instead of Next
I have logged in the issue and it will be addressed in next release
B) tried with copy and replace of the new scripts into the old folder (see comments at  in previous post)
Yes, you need to do the whole procedure from scratch to apply the attached script
Must declare the scalar variable "@RecoveryModel". Must declare the scalar variable "@RecoveryModel". Must declare the scalar variable "@RecoveryModel".
This should be fixed now.
Please try to use newly attached script package and get back to us, thanks.