The PowerPivot team is pleased to report that the fix for the November CTP expiration issue has been released. We know many of you have been eagerly awaiting this fix since last week when the PowerPivot for Excel add-in expired. We do sincerely apologize for the inconvenience this may have caused you.
We have released a new version of the November CTP for the PowerPivot for Excel add-in. This new version is functionally identical to the old one except that it extends the expiration date to end of the year. You can download it from the same locations as in the past:
Please note that the new version will take some time to replicate across all servers in the Microsoft download center. If you download it from the above links and still get the expiration error message, then try again periodically. It might also help to clear any browser/download caches on your computer.