The packages folder that is in LocalCache.
You are correct in your assumption.
It is only for holding mods.
OK if you can move some of them, this isn’t the issue.
I would delete the folders you have opened and separated and download the folders again, but only unzip (extract) them, do not remove anything from them.
Place the entire folder below in your Community folder.
Do not remove any of these from that folder:
You will need these files from Flightsim.to as well:
Do the same with them.
The only different one is the UK2000 object library.
For that, go to the Marketplace and in “search” type in UK2000.
It will display their sceneries as well as the free Object Library.
Download that, it will install itself in the Official One Store folder.