If you plan on adding PF to FB+AEP you can at this moment patch it up to 4.05m (nneding the 4.05m P-2 Peshka pay-for addon download) - The Sturmovik 1946 DVD will install to 4.07m in one go, but can't install to any other version. There will be downloads (pay-for) available to patch to 4.06m and 4.07m later. This simulator has been on the market for quite a while resulting in a lot of sometimes complicated patching. The Sturmovik DVD is priced at the total cost of the 4.06 +4.07 patches, in other words you get FB, AEP PF and patch Pe-2 Peshka for free as well as patch 4.06 (Sturmoviks over Manchuria and patch 4.07 (1946 Patch) bringing you to the latest version. In recent years allmost all users have patched to the latest available version within a year of it being published, merged the install and fly that online.
I agree Sturmovik 1946 is the best choise to go. It will save you the CD ahuffle and downloading of many MB of patches, while after 4.04 everything is pay-for anyway, so it will also safe you money going with the Sturmovik 1946. Some, not all DVD RW drives have problems with the DVD, but an upgrade to the latest drive firmware (drivers) will solve that 99% of the time.
You do have to disable virtual drive (CD/DVD emulation) software before you can install or run the game. an uninstall is only ncessary if the emulator has no disable/exit function. There will be a 4.08 patch in the future (free). If patching the oldfashioned way by downloading the patches, make sure to run the game after install and check in the lower left corner if the patch installed OK (The version number of your current install will show there above the "Loading..." message.
Any questions/problems feel free to post on these forums, we all will be happy to help wherever we can.
Give our sister site
http://Mission4Today.com a visit too, you will find a lot of (mostly free) resources for the IL-2 series sims there as well as Forums and news.
And welcome to Airwarfare!
It can be a bit confusing at the start, but there are many people willing to help you along.