Reassigning extension

I downloaded an extension for one of my end-users with my account. Is there a way to assign it to them so they can use it in their sketchup pro?

Is it a free extension?
If it’s free they can also download it from the extension Warehouse.

No I paid $10 bucks for it. How can I transfer it to another user?

I guess you have to contact sales support for this.
https://help.sketchup.com/en/contact-support/sales-question/form

Extensions are single user license, and can be installed while signed in with the associated email address. If you need that extension to belong to a different email address we can do that, but the entitlement will go away from your existing email address.

You should look for the reply my colleague sent to you in April 22nd, and answer the question about what email address the extension is under at the moment. The message will have come from prosupport@sketchup.com.