I heartly support this plea

In Corfù case, you just install it right away. I did the same and it works like a charm.

I installed them and especially Corfù with absolutely no issues. Corfù doesn't even need any file deletion... I think the problem was elsewhere.

I have all the ORBX products (Global, vector, NA LC) plus Pilot's FS Global Ultimate NG, and did tonight a fly from TNCM to TFFJ, nothing to report, maybe some blurry texture on St. Barts hills, but I think there's no high res there right?
So definitely ORBX is not to blame.

I know it's a very old topic, but as I see no answer... the problem with shadows is very common, you have to enable "Simobject receive shadows" in light options