Unfortunately the EQ6 installer is not compatible with Windows 10. EQ6 was originally designed for Windows XP and updates to the Windows Installer’s security policy in Windows 10 prevent it from being installed.
If you have EQ6, and cannot install on Windows 10, an option would be to upgrade to EQ7 at our upgrade discount:
EQ7 Upgrade will install the full EQ7 program on Windows 10, without needing EQ6 to be installed. All previously saved EQ6 projects can be opened and re-saved in EQ7: