One of the key things is when you get to a 'restore' point make sure you go to that thread and follow the directions there (usually deleting some folder for a clean install of new part). I did parts 1, 2, 3, 4, 5 and 9
The other main thing to is to be sure to install in the proper order and as the file names do not let them be listed in order in Explorer that needs to be double checked to be sure to get the order correct.
Also Extract all the parts in a temp folder (each part in its own folder) and then just move the files to the IL-2 folder one at a time choosing to overwrite. Do not extract to IL-2 folder as some people seemed to have issues doing it that way.
Also do not enable anything in JSGME while installing
When done run IL-2 Selector.exe and Select "The Jet Age 1946-2016" Game Type and adjust the memory to 1024
Save Settings and the Choose Start IL-2 Now