Have you revived your old Quake 4 CD-key recently? Did you find it on the back of the manual? Let the community know in the comments below.
If you purchased Quake 4 via digital platforms like Steam, GOG, or the Microsoft Store, you do not need to enter a key manually. The platform manages this key automatically. Activating Quake 4: Retail vs. Digital 1. Physical Retail Version (CD/DVD) Serial Code Quake 4 Cd-key