[?] Presentation Template and general License


I read the articels about the envato license, but I am not sure about one thing.
I would like to use a Powerpoint Template and alter it to my needs and build a template for my customers. Am I allowed to give them a Powerpoint File? Because they would by able to alter it and reproduce it. To stick with the license: Do they have to ask me everytime, they need a presentation?

Would they need an own elements.envato account to use it?

and what about buying just one element? example Visby Round by connary on Envato Elements
In case I want to give the font to the customer for further use?