SimGuruModSquad has published a forum post on The Sims Official Forums saying that The Sims 4’s upcoming update is going to change and upgrade the current version of Python – a programming language and software which is used to help develop the game itself.

The upgrade will change the .pyo extension which is going to be replaced by .pyc. This change is going to affect ALL script mods meaning that since November they’ll completely stop functioning.

SimGuruModSquad wanted to make sure that all modders are ready and aware of this change so they can prepare and upgrade their script mods in time.