Dear Sirs, I am experiencing the same problem as Ingemarsson. Tried to download the suggested .ddl file, but the system tells me that I already have the same file installed. Moreover (if I skip the .NET Framework installation) REX4 won't complete the installation because of the .cab file broken. (This is also pointed out by my 7Zip program when I extract the files). I downloaded 6 times from Flightsimstore and 1 time from FS Pilot Shop (another buddy wanted to buy it, and I suggested to try with FS Pilot Shop), but got the same result. Tried to unzip with Winzip and Winrar, and to download with freeware and payware download managers. I am a bit frustrated right now. Any help greatly appreciated.