Downloading mods

Finding mods for The Witcher 3: Wild Hunt
Mods are officially hosted on the Witcher 3 Nexus

Finding mods for The Witcher 2: Assassins of Kings
Mods are available from the Witcher 2 Nexus as well as the the official REDkit site.

Finding mods for The Witcher
Mods are available from the Witcher Nexus.