: Instant access to weapon sets (1, 2, and 3), infinite ammo, and no reload times.

Depending on the version, press F3 to open the in-game menu or use pre-set hotkeys like Right Shift + 1 to spawn specific cars (like the Infernus).

Which do you own? (Original PC disc, Steam, or Definitive Edition?)

Open the downloaded folder and extract all files (usually includes vc_trainer.exe and some configuration files).

Use software like 7-Zip or WinRAR to extract the contents of the download (usually trainer.asi or an executable file) into a temporary folder.