I have a ZXP file with a flash extension developed for CS5.5. The certificate that was originally used to sign it has expired, and I'd like to re-sign it with a fresh certificate. I'd rather not have to attempt to install a legacy flash tool and re-build using that, so if there is a way forward with just re-signing the ZXP file, that would be easiest.
I'm on a Mac, and I have ZXPSignCmd installed. My initial attempts seemed successful (ZXPSignCmd -verify is happy), but installing through the extension manager fails.