after several tries with the VMWare Image made by Till I have to conclude that an upgrade to 2.2.5 ISPConfig will NOT work as it did before.
One of the problems I detected is that when I make a new site (with www prefix) it gives "shared IP" when I go to that http://www
or http:// url within my browser.
So I used the Image before the upgrade, the 2.2.3 one, (benefit of working with images) and did the above action again, but now with luck and I become the "welcome" screen when I typed the site's url into my browser.
As I wrote I tried it more than one time, with and without an upgrade of the OS (Debian).