Please note that Content Upgrades PRO plugin has three license types:
- Single Site License, for use on 1 site only
- Multi-Site License, allowing installation on up to 5 sites and
- Developer’s License, which supports unlimited number of sites
Please check your license type. If you have a single site license, you can only use Content Upgrades PRO on 1 website at a time.
If you want to transfer plugin from one site to another, all you have to do is uninstall the plugin on one site and install/activate it on another one.