If you are using a or a network license server .
: The activator may lack the permissions to write necessary license data to the Windows Registry.
The transition to Windows 11 introduced stricter security protocols and architectural changes that often break legacy activators designed for Windows 10 or older versions.
Always run the "SolidWorks_Flexnet_Server" activation part before running the main program activation steps.
If Error 6 persists across older CAD deployments on Windows 11, it is highly recommended to migrate to a natively supported version of the CAD ecosystem. SOLIDWORKS Version Windows 11 Compatibility Status Fully Supported SOLIDWORKS 2021 Limited / Conditional SOLIDWORKS 2020 and Older Unofficial / Known Script Errors Cannot install SW2017 on a Windows 11 laptop : r/SolidWorks
Running into while trying to activate SolidWorks on a Windows 11 machine is a frustrating issue often encountered when using third-party activators (commonly known as SSQ activators). This error generally indicates a breakdown in communication between the SolidWorks application and the licensing server, or a failure of the activator to properly register the license files.
To avoid running into licensing errors moving forward, keep the following best practices in mind:
: Security software often flags activation tools as malicious and blocks their execution or registry modifications. Recommended Fixes Cannot install SW2017 on a Windows 11 laptop : r/SolidWorks
If the software is already installed but fails to activate, use the built-in repair tool. Cannot install SW2017 on a Windows 11 laptop : r/SolidWorks
Locate the activation file (typically named SOLIDWORKS Application Activator.exe or a similar .bat string). Right-click the file and select . Navigate to the Compatibility tab. Check the box labeled Run this program as an administrator .