Hello!
Thank you both again very much!
I got it to install (5.6) using the automatic way after increasing the swapfile size @HIRAM (to the 2048 limit there seems to be?) - took very long, but I am stoked it worked out and I did not have to go the manual route.
All the best,
Alex
PS: tried the first few RAW conversion (XTrans files) - it is slow but does work without crashing so far!