Ok, I uninstalled P3D v5.2 HF 2, but didn't uninstall Orbx Central.
1) When fresh installed P3d v5.3, and then oppened Orbx Central, it showed Orbx Global, Libraries and Airports free as already installed. They were installed to the Main Library instead of P3D, but ...
2) I decided to cycle their install, uninstalled the three, then reinstalled.
- It looks like everything is working ok, so apparently this 5.3 doesn't bring incompatibilities with Orbx Global, Libraries and Global Airports ( free version ), but I would like to know if his is correct ?