Migrate site licenses

Not sure this is the right forum but I’ll give it a go.

I’m hosting & managing several WP installations that I’ve built. Sometimes, a customer wants me to host their site, that has been built by someone else, and contains some envato-purchased products that were bought by the previous developer. Bought and paid for, but registered to somebody else. Therefore, I can get neither support nor updates.

How can I possibly migrate those licenses to my account?

no, it is not possible to transfer license from one account to another. purchased item download, license and support only for the original purchaser account. Thanks