Creo 3.0 Licence Expired.. PLEASE HELP

Hi Guys. 

We have 34 Machine which has installed Creo 3.0 since last year. Now we have a little or big problems that the license has been expired. Where could I get a new license for Creo 3.0 or the worst bit is to uninstalled Creo 3.0 and installed the latest version Creo 6.0?

Any advice from experts.

Please help. 

Kind Regards

Bhav