A) You can stick with the old exam. If you do this, I'd get hopping on Part II, since your time is running out. With regards to Part III, contact Sun Learning via the links on their website, and see if you can get one of their (very limited) vouchers for that exam, before they're all gone.
B) You can start over with SCEA 5. You'll need to redo Part I, and pay for it, but you can contact Sun Learning and see if they'd be willing to accept your Part II voucher for buying the new Part II when you get to that point.
Either way, contact Sun and find out how to proceed. That would be my best advice.
Theodore Jonathan Casser
SCJP/SCSNI/SCBCD/SCWCD/SCDJWS/SCMAD/SCEA/MCTS/MCPD... and so many more letters than you can shake a stick at!