iOS The iPhone could not be synced because this computer is no longer authorized for purc

I have an app in development and need to load the latest IPA for testing, a process performed through iTunes, like syncing anything else. When I try and sync I get the message, "The iPhone could not be synced because this computer is no longer authorized for purchased items that are on this iPhone."

I did the research on the internet and haven't found an adequate answer. I've tried:

— Being sure I'm logged into the same iTunes account as the iPhone.

— Deauthorizing then Authorizing the computer, after which I get an alert saying the computer has been successfully authorized, resulting in the same error message again when I again try and sync.

— Removing the SC Info folder, as found in this article: http://support.apple.com/kb/TS1389 . I guess I have the only Mac that has no trace af any such "SC Info" folder anywhere in the system (OS 10.6.8).

— Logged in under every conceivable account configuration (computer admin, device account, etc...) to no avail.

I have to get this IPA imported into the iPhone. It's the same process as syncing anything else. If anyone has a solution, please send it along. Clock is loudly ticking.

Maybe a better question would be, Is there a way to import an IPA without using iTunes?

Many thanks.

Cayce