There're thousands of add-ons on the Web for the classic FSX and Prepar3D v1 to v3. Take off from anywhere in the world, flying some of the world’s most iconic aircraft to any one of 24,000 destinations.
There seems to be alot of conjecture on how to move FSX from one computer to another and if upgrading to another O/S is going to cause a loss of files etc., This isnt so, as an example, i havw a HP6000 Duo Intel, era 2006-07, i wanted to clear out and wipe my drives and be able to upgrade to Win10, which i was told was impossible. I went to Microsoft and downloaded the Win 10 program, and went thru the process, and compressed the fsx file and moved it over the same way, and that was from Win 7 to Win 10 and even with the newest anniversary update. Another thing to do with wi 10is go into setttings and game settings on, for top graphics. If you go with the download assist you have the option ti keep files and what backups.