Events Calendar Pro does have licensing for multisite in the fine print. You may not need that level of a license though. How many sites within your multisite are you planning to install the plugin on?
It is worth noting that using a lesser license on multisite will require manual updates and may not notify admins of the update being available. This issue is due to some of the constraints of multisite.
Hey there! This thread has been pretty quiet for the last three weeks, so we’re going to go ahead and close it to avoid confusion with other topics. If you’re still looking for help with this, please do open a new thread, reference this one and we’d be more than happy to continue the conversation over there.