Here you can find the latest versions of the iFly2FSUIPC addon.
You need MS Visual C++ redistributable to be able to use these with your Prepar3Dv4.
You can download x64: vc_redist.x64.exe from MS Support pages.
New beta version:
Older beta version:
Stable v4:
Offset lists and usage instructions can be found via the menu bar.