To understand why a 10 MB download is not feasible, one must compare the actual size of the game against the claimed compressed size.

Conclusion: A 10 MB file claiming to be the full GTA 3 game is mathematically impossible. It cannot contain the necessary data to function.

Many websites hosting these links operate on "Cost Per Action" (CPA) marketing.

Look for repacks by trusted groups like Mr DJ or RG Mechanics. These are not 10 MB, but they use extreme compression methods (LZMA2) to pack the 1.2 GB Steam version down to 250 MB - 350 MB. You extract the file, run a setup (which takes 10-15 minutes), and get the full game. These are widely considered safe if downloaded from reputable archival sites.