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are you sure that i can upgrade without any risk ? (end of first question)
I never said you could?
Did it make any hacks to the core of XOOPS files?
Did it make any DB changes?
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it changed the structure of tables ...
From that I would say not, unless you revert those changes, I would say upgrade is impossible, unless you know what to do, or some one that knows what to do, does it for you.
You've turned sessions off now, so it won't display a session ID, you now use Cookies which stores information on the users computer, rather than the DB.
You can change the user cookie to one of your own though!
If you wish to know the difference or how they work, you could do a search on google or something cookies Vs Sessions. Or a dev maybe kind enough to explain for you.