According to the duration a license can be used, licenses can be divided into 1-year License and Lifetime License.
One-year License allows you to have plugin updates and Premium support for one year. And after that you can renew your license by purchasing another one.
If you choose not to renew your license, all your existing plugin configuration and data will remain intact, and the Pro features you have will continue to function as before, if the versions of both Free and Pro remain exactly as they are at that moment in time. However, if you continue to update the free version of a Molongui plugin, but do not update the Pro extension, then over time, the two will likely become incompatible with one another, and problems may occur. The code for the free version of the plugin is constantly being updated to add new features, fix bugs, and solve security issues. These code changes may eventually conflict with the old version of the Pro extension that is not being updated as well.
With a Lifetime License, you will enjoy plugin updates and Premium support forever.
And according to the number of sites the license can be activated on, licenses can be divided into Personal, Plus and Agency license.
The Personal License can be activated on 1 site.
The Plus License can be activated on 2 sites.
The Agency License can be activated on 5 sites.
In a multisite installation, you need to activate the license on a site-basis. So you need as many activations as sites you want the Pro plugin to work on.