Question on License vcenter 5.5

Hello Folks,

Small doubt Just wanted to know as i am gng to upgrade the vcenter from 5.0 to 5.5 and i have downloaded the vcenter 5.5 evaluation copy and using in testing environment but now the 60 days has been over so if i am going to install over production i think that will continue to work as we have 5.0 license in place.

Any suggestions ??

Thanks