I assume you're running a Mac with an Intel CPU.
Fusion 6.0.2 is not supported and will not run on Monterey. You will need to upgrade to Fusion 12. Your virtual machines will still run.
If you are using Fusion for non-commercial (personal use) purposes, you can register for a free personal use license of Fusion 12 Player.
- Paul (Technogeezer)
Editor of the Unofficial Fusion Companion Guides