Traktor S4 - Big issue to Reinstall (find) an old version to my Mac Intel i7

Guidini

The software was running fine, but I started having trouble reading new songs, folders and playlists. Initially, I thought it might be a RAM issue, but Apple's Activity Monitor didn't show any spikes in memory usage.

I added a new set (playlist) directly through Traktor's file manager, and now it's messed up! It doesn't run anymore... It starts, begins to read the tracks, and then freezes.

My setup is old, an old machine dedicated to the S4, and everything was working fine... Can anyone help with this issue?

PS: NI support is really bad...