Hi Troy!
Thanks for contacting us. This question is covered in our FAQs.
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Technically, you only need one license for a multisite installation because you only input the license on your main network site. However, we ask that you purchase the license package that accurately reflects the number of sites you’ll use the plugin on. For example, if you are planning to use the plugin on a 10-site multisite, we ask that you purchase our Developer level license. That reflects the amount of value you’re getting as well as covering any support you may need on those sites.
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Does this make sense? Let me know if I can explain anything else!
Cheers!
– Casey Driscoll