Thanks, I now have a functioning version of SimEx 120.1.2. I've absolutely no clue of what to do with the various new forms of signalling, but a bit of Wikipedia and some trial and error should lead me the right way.
Going through the config files, I still can't seem to find a way to enable liveries while having use_timeline set to 0. Is it possible have liveries, but the entire timeline's selection of infrastructure?