You cannot install custom IPAs on a stock iOS 6 device without preparation.
Tap the file and select "Installer" to let AppSync bypass the signature check. Bypassing the "Date/Time" and "Version Too Old" Errors whatsapp ipa ios 6
Look for vetted preservation projects like the or Internet Archive (Archive.org) . You cannot install custom IPAs on a stock
Requires an already active session, often disconnects permanently. Broken often disconnects permanently. Broken