How to install jar file on BB Z10?

First off, welcome to CrackBerry!

So, jar files were one of several app types that ran on the legacy BBOS devices, like Bold, Curve, etc.

Device like your Z10 run the new BB10 OS, which is 100% completely different than legacy BBOS. BB10 for the most runs bar files or apk files for Android apps. Sorry, jar files won't run on BB10.

Was there a particular app or game you were interested in? Maybe someone can suggest an alternative available for BB10