An error occurred while retrieving your license

James Greenfield wrote:

I didn't return the activation of Studio 2014 beforehand. I upgraded about a week ago. Thank you for your assistance.

[Edited at 2016-06-08 14:00 GMT]

[Edited at 2016-06-08 14:01 GMT]

Alya wrote:

Just in case if anyone else might have run into the same problem, the following article from the SDL Knowledge Base has helped me:

Click Start > Run...
Type: services.msc
The Services dialog will open.
Scroll in the list to:
Nalpeiron Licensing Service
Nalpeiron Control Service
Right-click on Nalpeiron Control Service and select Properties.
In the Properties dialog box, switch the Start Up Type option to Automatic.
Click Apply and OK to confirm the changes.
Right-click on the service name again and choose Start.
Repeat step 5 to 8 with the service Nalpeiron Licesing Service.
Close the Service dialog and start Studio again.

Source:
http://producthelp.sdl.com/kb/Articles/4497.html

Please note that in my case, the error code was
ServiceVersionNotCurrent -65

If you get a different error code upon trying to deactivate your license, you may need to look for a different solution.