My error in Unity 5.3.4 in activation.
How to fix this error ?
Please help 
How about pressing reactivate?
And if that does not work please post the error massage.
Try running unity as a administrator user the current user probably has not the permission to write the license file into the correct folder.
I read somewhere to delete C:\ProgramData\Unity
That helped and I could reactivate.
My problem though is that Unity throw that exact license error each time after I restarted my computer. The license problems started after the last big update of Windows 10.
I’ve also tried to return the license after I reactivated and did activation again.
Starting Unity as admin to do the activation did not help either. After restarting my computer Unity forgot it was activated and I have to activate again.
Guess I’ll try reinstalling it next… but for now I got work to do.
Hi Leslie,
It may be that you’ve maxed out your activations which is throwing up your error. A change in Operating Systems can sometimes do this.
I would suggest dropping us a message in free support with your license details and we can take a look.
You can use the form here: https://unity3d.com/contact/get-in-touch?type=info