manual installation in gta_vc.dat:
After 
IDE DATA\MAPS\haitin\haitin.IDE
Paste
IDE DATA\MAPS\skate\skate.IDE
After
COLFILE 0 MODELS\COLL\GENERIC.COL
Paste
COLFILE 0 DATA\MAPS\skate\skate.col
After
IPL DATA\MAPS\stadint\stadint.IPL
Paste
IPL DATA\MAPS\skate\skate.IPL