there's a difference. Lindsay released 4 tree libraries, if my memory serves me right. The last one was released through his website, which he called "Pro" or "high res".
The difference consists in their framerate performance, which becomes progressively heavier with every new release. While it is true that I still run CFS2 on a 10-year old pc, when you fly escort in one of those airport-busting missions with various objects on the ground, AI bombers and AI foes attacking them, you and your flight defending the bombers, AA in the air plus explosions on the ground, let alone if some of the aircrafts involved are not multi-res, I discovered a while ago that those trees in the scenery do make a lot of difference!! :dread:
When I do GSL work I only use his earlier...