Hi Laura,
I apologize for the delayed response, I didn’t receive the notification for your post on the Support Forum.
From what I can see, you want to use the Site Admin email address as the From address for ALL Invite Emails, is that correct? If so, I can update the plugin to make that adjustment for you. I can add a setting for this as well. I can have it ready for you by Friday at the latest.
Please let me know if this works for you, and we can proceed from there.