The digital landscape for user-generated content (UGC) is strictly regulated. When a popular "G Poly" track link goes down, it is typically due to one of three reasons:
Check sites like GameBanana or Nexus Mods. These platforms have different moderation standards than the Steam Workshop and often host "unbanned" versions of popular maps.
For high-quality poly tracks, developers sometimes move their source files to GitHub. Search for the track name followed by "repository" to find raw asset files.
Once you have secured a working link and downloaded the files, you will likely need to install them manually since the one-click "Subscribe" button is no longer an option.
Join dedicated racing or GMod mapping servers. Users often pin "mirror links" in the #resources or #downloads channels to bypass workshop bans.