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My question is: I could have copied the folder from a2 to a3 version?
No, there have been to many changes, as it is usual in an "Alpha" development.
Please make a fresh installation of the GitHub files,
a) fork the XOOPS 2.6.0
from GitHubb) install Composer and run "composer install" from within the /xoops_lib directory
c) go to your browser and start your XOOPS installation as usual
If you follow the steps as shown
in this video, it should be no problem...

Sometimes the code might be broken, so just to make sure that everything is OK, I just downloaded the current files from GitHub and installed XOOPS 2.6.0 without any problems on my WAMP Server.