People, I finally got macOS Sierra running on my Macbook pro 17 mid 2009, everything is running good, except for WIFI... no Wifi and no LAN...
I went and got a support sierra macbook air; I installed a clean copy on a external hard drive, but did not setup any account stuff on the supported macbook air; I then went to OsX El Capitan I then ran the script that uploaded here in page 19 from "NOTNICE" ( sorry if I got the name wrong ); next I copied the Platformsupport file to it's proper place like it is said on the first post, I then got kext installer and dropped all those kexts to the proper place ( the kexts are on the first post also ) all this still on the external hard drive, but DON'T boot it from the external hard drive! I went and got "Carbon Copy Cloner" and a cloned the external drive to a new one made on my unsupported macbook pro 17 mid 2009, and BOOM macOS Sierra runs like butter...... Except for WIFI and LAN no networking at all...
Is there a kext to make Wifi work? Is it possible to make somehow?
I hope my post helps others to get it done ;-)