Since 5.1.0.4 is an older version, you won't find it on the main ManyCam landing page.
Many modern software titles have shifted to subscription models. Version 5.1.0.4 operates on a classic perpetual license model. Once activated, it won’t constantly prompt you to upgrade or subscribe. download manycam 5.1.0.4
: If you are running Windows 10 or 11, you may need to run the installer in Compatibility Mode Since 5