Sort of solved with following steps:
- Deleted folders “RAATServer”, “Roon” and “RoonServer” from %AppData%\Local\
- Installed from latest (1353) installation package
- Pointed Roon towards existing ROCK
After setting some settings like theme and audio devices back to previous settings averything appears normal, album art including Live Radio etc are back to normal.
The huge memory-usage is still there, I still can not understand where Roon frontend on notebook is wasting 1Gb of memory?