Some users report success by installing SolidWorks on Windows 10 Pro first and then performing an in-place upgrade to Windows 11. Alternative Activation for Licensed Users
If you are on Windows 11, the 2017 activator may struggle with the newer OS kernel. Some users recommend performing the activation on a Windows 10 environment and then upgrading to Windows 11, or using a newer version of SOLIDWORKS (2020+) that is natively compatible with modern Windows versions. solidworks2017activatorssq error 6 fixed