Have downloaded from avsim/flightsim one or two of these with mixed results in times past. Worked well for awhile and a godsend of course when that long flight is stopped due to some unforeseen memory leak or overheating cpu etc. I uninstalled though because I found each time in took its "snapshot" e.g. every 5 minutes it would stutter or hang my system. However, after one too many ruined almost perfect flights, I have re-installed one or both progs but they don't seem to work or I get error messages like they have some kind of bug. Any other alternatives or experiences out there?