I have just updated/installed a new Operating System. Why is my license failing to activate?

It was enough to delete the license file *.ulf, then activate free, run unity, and activate pro/plus (license check still hanged, but you can close it)

I'm using Windows 10 and this happened after an update.

I tried everything and more than everything, nothing worked, the only solution I got was to revert the update. This is easily done in the "Recovery" settings.

Hi Sergio,

If you have a Plus or Pro license activated on your machine, it may be that you need to return this activation in order to activate on your new OS version.

You can return your activations when logged in at id.unity.com and under the 'My Seats' tab. Alternatively, you can return them from within the Unity Editor.

- Click 'Help'

- Click 'Manage License'

- Click 'Return License'

Is there a programmatic way to free our licenses? Having to manually sign into the webpage is a problem. Do you have a web API that we could use to release/return licenses?

Hi there,

We do have some command line arguements to release licenses which you may find useful: https://docs.unity3d.com/Manual/CommandLineArguments.html

This will do the trick...

- Close Unity and Unity Hub app
start cmd.exe as admin
for /f %i in ('tlist ^| findstr /i unity') do (kill -f %i)

- Delete (or back up) the local license cache files
C:\ProgramData\Unity>del *.ulf

- Delete any appropriate activations on the service side
Online: https://id.unity.com/en/serials

 - Restart Unity Hub app. Provide product key. The last button will be "Install Unity", which is misleading - you already have Unity installed. It's should just be a success message with a Continue button. Clicking it will take you home.

- Keep calm and go about your business. ;)

Sorry not working for me. Also you should update this page as it is not saying anything about Unity Hub which is actually managing the licenses. I have contacted support now, as I am not able to solve the problem.

I had the same problem the last two days. The following worked:

Please go to: https://id.unity.com/en/serials

And remove _all_ assigned values. Then Activate again with Serial etc. in Unity Hub.

Problem solved if you are using unity hub(i am using unity hub 2.1.0) to manage your unity license!

First, delete  C:\ProgramData\Unity.

Then, remove all activated device values in your unity ID site(My Account->My Seats) 

Finally, restart system and enter your serial number in unity hub.

Not happy with this solution.  Time is precious.  Do a better job please.