I accepted the upgrade from P3Dv5.2 to 5.3. In the process I lost my scenery addon files, backups and everything!
Now I have found my most favourite scenery addon (NZNR) but it needs other libraries to be installed for it to work.
One such item is the Vector Land Class Object Libraries. However, this will not install in P3Dv5.3 because it "cannot find the installation path of P3Dv3 in the registry".
It's unfortunate to hear about your lost scenery add-ons and backups after upgrading to P3Dv5.3. I understand that you're looking for a solution to either use contemporary add-ons or roll back to a previous version of Prepar3D to reinstall your desired scenery. Let's explore a couple of options:
Rolling back from P3Dv5.3 to an earlier version is generally not recommended, as it may create further compatibility and stability issues. If you choose to go this route, you should be prepared for potential complications and may need to reinstall all your add-ons from scratch.
In summary, I'd suggest looking for newer and compatible add-ons or trying the manual installation route. Rolling back to P3Dv3 should be considered a last resort, as it might lead to more challenges.
I hope this helps, and happy flying!
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