Error Message Appears When Trying To Play Myhouse.wad

[DSC]

This isn't really an editing question, so I was hesitant at first to post it here, but I figured it was the most appropriate place anyways. My troubles are the following: whenever I try to play the pk3 of myhouse.wad on GZDoom  those error messages appear. What should I do?

[jaeden]

+INVISIBLEINMIRRORS was added to GZDoom in version 4.8.1. You have 4.8.0.

[DSC]

Oh, I see, outdated version. Thanks!