Hi there!
I’m new with running/using SimpleHelp, so please excuse the ignorance. I would like to customize the email invite that gets sent out when sending a standard invitation. I’ve copied the Templates/Invitations folder from the /lib folder to the /configuration folder. And I’ve edited the two templates (invitation_quick_email, invitation_support_email) but I continue to get emails that are based on some template that I cannot find.
Any thoughts on this?
Doug
Check your custom invitations. you may have one thats acting as default. Delete any not in use.

Directions here:
https://simple-help.com/technician-guide---51#Invitations
Seems you already found this, but I will leave this here as well.
How to configure the invitations:
https://simple-help.com/administrator-guide---51#Email-Templates
Hope this helps. Other then that I am not sure. You will need to send in a ticket to support for help as the community forums are not monitored by the devs and are just for us to help each other and share ideas.