These are out for the enhanced release all owners of Quake on Steam/GoG got for free when Nightdive remastered Quake I/II.

Unfortunately they break the limits of the original game engine and usually require something like Darkplaces[0] to run. Although I highly recommend darkplaces for even players of the original Quake because the QoL improvements are nice.

[0]https://github.com/darkplacesengine/darkplaces

I figured as much. Some of the addons for the 'modern' Quake seem to really stretch it way beyond anything we saw out of the original engine.

Also love that there is a 50% chance that you can crash a Ps4/Switch just loading a level with the Slave Zero mod that they provide. They are pushing it fairly hard with that one.