Licence expired

While working with my Rhino 5 Commercial suddenly a window popped up saying my licence has expired and I cannot save my work.
I have a legit licence key purchased back in 2010 (?) and the program is used on a single computer only. What’s going on here? Does the licence key really expire after 10 years?

thanks
Cyana

The license does not expire. A Rhino 5 license would have been purchased in October 2012 or later.

Contact Rhino sales for assistance: sales@mcneel.com :

Thanks for your reply. I’ve now looked for my papers, actually I purchased the license on August 31th 2015, so quite exactly 5 years ago. Luckily I found my license key within the papers and entered it again and it was accepted. Will contact sales should it expire again.