I have to reinstall FSX, along with the SP1 and SP2. I now have WIndows 7 Pro. Do I need the SDK and FSUIPC4 apps?
i don't know..........Notice that your posts is the same number as my posts now 😀
If your only going to fly then you don't need SDK's.
If you need FSUIPC4 for a certain aircraft or for certain hardware (the read-me of the products will tell you) then you will need it (used for tweaks).
I don't use it for just normal flying.