Extract the files to a folder named "don37" and add the following to the season.ini (where XX is the event number):
name=Donington Grand Prix 1937
I think there's a lot of unused rubbish in the zip (hence the size). I tried to remove most of it but I've forgotten which files are needed and which aren't.
I'll post updates here from time to time.
It's beta, so obviously incomplete and a bit of a mess in places. If you find any major problems (e.g track won't load, CTD) please let me know; other minor issues I'm probably already aware of so no need to remind of them...
There is AI but it's poor - I only made it to test frame-rate during a race... which is also poor. Probably best to stick to hot-lapping for the time being.
And finally, please do not use any of the files (3dos, mips, srbs, etc.) while the track is in the beta stage.