So, here's a follow up on the issues I had experienced with this update to 2.5.2:
The installed version would just not update to 2.5.2, and there was no repair option...
So, before re-installing from scratched, I had moved the old version over to a different disk, as a backup. Next, installed the new one, into a differently named folder, and created a new shortcut for it. It was updated and shift and all...
Then Yesterday, post Clod session I fired it up, and all was well. Very well. Flak bursts and all.
Now today I found out that the original shortcut had changed itself to the new location of the moved folder... so in fact I was running the original troubled version yesterday! No idea how it got updated though, must've happened when I thought I fired up the newly installed one, but in fact use the wrong/old shortcut? (This would explain just fine how all content -spit, P51, Normandy- were all active and present after the new install though...)
Anyways, deleted the newly installed one, and moved the original contents back to its original disk.