Determining which version of Communities you're on when you 'manually' upgrade Communities
Because the TargetX Communities package is 'unmanaged'; Administrators have the option to 'manually' implement changes when a new release is available. In this case, the version number listed under Installed Packages will not reflect an updated version.
The best way to keep track of which version you have upgraded to is to add a Comment into the Communities Home Visualforce Page (TX_CommunitiesHome). Add a comment at the TOP of the visualforce page like this:
<! -- Manually updated to version 1912 on Feb 10 2020 -->
The next time you perform a Communities update you can refer to the Communities Home Visualforce Page (TX_CommunitiesHome) and look for the comment to see which 'version' you have.