One reason the "Quake Pak Files Download" keyword is so popular is modding. Total conversions like Arcane Dimensions or Contract Revoked often come with their own PAK files.
A: The shareware pak0.pak (Episode 1 only) is legal to download. The full commercial PAK files require purchase. Quake Pak Files Download
Get your legally obtained PAK files into a new directory. One reason the "Quake Pak Files Download" keyword