I have downloaded the three seperate files that make up inventor professional 2011 and moved them into a folder. I then run the .exe file but then an error message pops up saying "The version of this file is not compatible with the version of Windows you're running. Please check operating system.........
I have triple checked it and my operating system is Windows 7 64-bit home premium.
The file names even say "Win_64bit".
Please check if you have x64 folder inside the installaton source.