If i would buy the Professional version for schools account, would it be tied to that account and could be used on other projects after i'm done with mine?
the license is tied to the organization who purchased the Asset. There seems to be no official way to transfer a license to another organization (e.g. from school to you personal) if you purchased on the Unity Asset Store.
You could purchase the license directly from us. For doing so please just fill out this form (Button "Request a quote" and you will get an offer: https://game4automation.com/en/buy
We could allow you the transfer if needed later on based on a simple mail you are sending to us.
Customer support service by UserEcho