About Sakhir, just make sure the files are in the correct folder.
You should heve this folder with some jams...
...grand prix 3/gp3jamsh/belini/tracks/sakhir
and other 2 subfolders labeled "2004" and "trees", both with other Sakhir's jams.
But I think it is still necessary to install belini's generic jams to have textures in the garages and lines in the tarmac. I had an hd problem and I didn't download everything again yet :P