Make sure to first have SuperBLT, and CustomOST installed. Click the links in the dependency list.
Optional video tutorial for installing SuperBLT, BeardLib, and mod_overrides mods: https://youtu.be/rin_sjSJIkg
mods\CustomOSTTracks
If you are using the custom ost version put the folder into "CustomOSTTracks"
If you are using the beardlib version put the folder into mod_overrides