In the context of SOLIDWORKS (particularly versions 2018-2023), typically indicates a handle mismatch or memory corruption within the licensing service. Translating from low-level system code:
Windows 11 handles user account control tightly. Standard execution often starves the activator of the permissions required to modify system-level directories. error 6 solidworks activator windows 11
for activation if you frequently test different licenses (Windows 11 Hyper-V or VirtualBox). error 6 solidworks activator windows 11
Now, install a fresh copy of the license service to ensure it's running correctly. error 6 solidworks activator windows 11