Kent, the model will work in FSX Acceleration without the Steam version. To clarify, the installer has the option to install on either or both versions (if one or both versions of FSX are detected). It is also important to note that the P3D version is separate and to obtain that version, it is a separate purchase. Right now they are offering a temporary discount for existing FSX NGX users to obtain the reworked P3D version. I'm not totally familiar with the terms and costs and anyone who's interested in the P3D version should consult PMDG's website for more information. Regarding the P-8A, it is included in all versions(FSX/FSX.SE & P3D) and it is a stand alone aircraft folder. There are extra P-8A two repaints available in the PMDG Operations Center. Regarding the Paint Kit, as far as I can tell the original 2011 dated Paint Kit files are still current for the 800/900 series and the 600/700 expansion pack has been updated. I have seen no specific Paint Kit for the P-8A and am unsure if the 800/900 files will work as there are many new parts on the P-8A exterior model.