How to force an apk to install? I have an early build of CM12.1 running on my ZenFone 2 and I'm working on trying to get the ASUS camera app to work with it, however when I try to install the apk, it fails.

adb install gives me Failure: [INSTALL_FAILED_DEXOPT]. I was wondering if there was any way I can "hack" the apk in order to force it to install the app anyway, instead of throwing an error.
That type of issue is mostly often caused by an app going over something called a "Dex limit", which has to do with the external libraries an app uses. If you're interested, there's an explanation over on Stack Overflow.

This type of problem has been solved for some people by wiping the device and reflashing.