Tried to set up your application on our system. But unfortunately, there were errors. Nothing happens when you save the settings for a recurring activity. Activities are not duplicated (although there is no error).
This package in the marketplace is for MSSQL systems only. If this is a could system it's most likely a Postgresql system, not MSSQL. The package will install on a Postgresql system, but won't work (and I believe doesn't show any errors). Do you know if the system it's installed on is MSSQL database or not?