Unity Pro license, about time and actualization

Hi. If I work in Unity free version and I updated to Unity pro ? I can sell my product without problems ?. And the other question is how long is the lifetime of Unity pro license. It’s forever ?

I currently work in a project and my team are stressed about the 100 000 dollars for year about the free license. And we have wanted to update the version before sell of the game. Now we can import the proyect to Unity Pro and sell the product ?

Thank you for the answer and sorry for me English.

Yes, you can upgrade a project created with Unity Free to Unity Pro without issue. Note that each team member will need a Unity Pro license (“per-seat”) to continue working on the upgraded-to-pro project. License purchases are for life, but only for the version you buy: Buying a 4.x license doesn’t grant you a 5.x license, though you’ll get to buy into the next numbered version at a discount.