If you would like to remove the SnapMagic Plugin from your Altium Designer. Follow these steps:
Make sure to close Altium Designer before uninstalling the Plugin.
Go to C:\Users\Public\Public Documents\SnapEDA Altium Plugin and double click on the unins000.exe file.
At the SnapEDA Altium Uninstall window click Yes.
Once done you will see a window indicating “SnapEDA Altium Plugin was successfully removed from your computer”, click OK.