For those using legitimate standalone licenses, remember that "Activation Count Exceeded" errors (which can sometimes be confused with activator errors) require transferring a license from an old machine or contacting a SolidWorks Reseller for a reset. Error 6 Solidsquad - Google Groups
The symptoms of SSQ Error 6 include:
To resolve SSQ Error 6, follow these step-by-step troubleshooting guides: Solidworks 2018 Activator Ssq Error 6
Right-click setup.exe → Run as Administrator. For those using legitimate standalone licenses