Thanks for the info.
Yes, I have used Simviation before. I would wait until I had a large list of stuff I wanted and then pay for a month and download it all. Last time I got every mission/flight in their FSX library.
However, I am very cautious with those pay sites for downloading freeware. I don't have a problem with it, but two sites have speed or download restrictions unless you pay - I paid and the transfer speed remained awful. I even paid one multiple times and every time it was very slow or broke off halfway through 'large' downloads (CombatAce). They aren't normally considered large at around 500MB, but when the speed is 1-200kB/s anything over 20MB is large!
Anyway, I am now using a second computer for the downloads. Slow downloads can be a pain, but it's being unable to use my PC that is the worst thing, one of the reasons I kept my old PC when I upgraded.
Edit: Wow! Thanks for the openscenery link - what a difference! 8.3MB/s - that's more like it!