Upgrading from Jem 3.0.4 to JEM 2.2.x

Here:
edit: I deleted this link and sent it by PM because I don' t want that more users will try this on livesites and have then more problems!

I deleted the link here and sent it via PM to provide tha no others would use this on a livesite and get much more problems

I installed your JEM 3 on a testsite. There is indeed in backend>Jem>Settings>Global Parameter a "Cleanup DB when uninstall". You've to choose this before uninstalling JEM 3. Then the db should be ready to install JEM 2.
If you have events, categories, venues and catevents, you should export them to csv. And then compare it with JEM 2 export files. (There are much more possibilities in JEM 3 to export. you can't use in JEM 2. If you have images, you should them manually export via ftp (images/jem/...)

It didn't work...
It says now I don't have a table, take a look at the attached screenshot

what didn't work?
installatione di JEM 3? or uninstallatione di JEM 3 dopo installatione di JEM 3? o installazione di JEM 2 after all?

Jem 3 installation...
it said it didn't find the table jem_events