I did find something else out on my particular version, I have the version ending in .219, and per their automated support line you MUST go through the Online Updates link in the control panel to get the update for this version. So you have to load the program first, then get online, then bring up the control panel, and then go to online updates. From there you need to reregister your program and then Update To Latest Version. I got it downloaded late last night and haven't tried it yet, but at least I was finally able to make some headway without getting an error. Hope this helps!

Depending on your version just downloading the install patch from realflight.com doesn't work. It didn't for me.