Since the original software is now considered abandonware, it is no longer sold or officially supported by Altium . You can typically find it through community-maintained archives:
Right-click the executable, go to Properties > Compatibility, and select "Run this program in compatibility mode for Windows XP (Service Pack 3)". circuit maker 2000 download 64 bit
Ensure you select "Run this program as an administrator" to prevent permission errors during simulation. Since the original software is now considered abandonware,