There are three types of License
1. Single Site
This license is meant to use on One live website. If you have multiple stores you need to buy multi site license.
2. Multi Site
This license is meant for multiple websites usage. If you wish to install this plugin on different websites this license is for you upto 10 sites.
3. Developer License
This license is unlimited , you can install it on any number of sites .
Single Site License Recommended for
If you are store owner and its just your single store you work on
Multi Site License Recommended for
If you have different businesses and different stores
Developer License is meant for software agencies, companies and developers.