How do you upgrade the Powerbuilder Virtual Machine on EAServer?

I am upgrading from PB 11.5 to PB 12.5. I renamed the current folder (C:\Program Files\Sybase\EAServer6\PowerBuilder) and then created a new Powerbuilder folder that contains the PB 12.5 DLLs. It appears to be working but I have the PB Heap summary turned on and it is complaining:

      PbHeap_dumpSummary [JaguarServer] Warning: There are no valid PowerBuilder versions installed.

Thanks for any help,

Mark Yanni