Most work is in trk :
- delete teammaps2.gtr and replace it by teammaps.gtl (you have all SimBin shared files inside this file if you have installed my hq anniversary patch, if you don't have installed my hq patch then you must copy misc.gtr in locations\shared)
- inside SKYBOXI instance you must delete all ****R blocs (used for rain in gtr2), in general it is at the beginning of trk
- if there are rreflectxx instances then you must delete them (used for rain road reflection in gtr2), in general they are located at the very end of trk
With that it should work