Hello.
With the recent 3.1.2 update, i realized that installing that update to my 3.1.1 websites would be a nightmare.
Because we have done tones of changes/fixes/modifications. Almost impossible.
This is getting worst because there is no separate "update-only" files of Osclass. You must re-upload ALL files, changed and unchanged.
I would suggest to have two sets for each release, one for New Installations and one for Updates only (with only the changed files).
Thanks