Sorry guys for being late, but I'm still heavily involved in some projects and duties atm. I already prepared a new version which I still need to polish a bit before releasing.
The next version, as already posted previously, will definitely be again compatible with Windows XP
Personally I would recommend, if possible, to install Windows 7, because XP has reached its EOL (end of life) and will not be supported anymore (especially concerning security updates).
But again, UME will be compatible to Windows XP again and upwards starting from the next release.