There are some things that don’t work great directly “ out of the box” so to speak. You also might want to install the Hi-Resolution Pack that is hosted by them as well. The source code is licensed under the GPL version 2, and was first released under that license by id software on August 20th, 2005. Ioquake3 is a free software first person shooter engine based on the Quake 3: Arena and Quake 3: Team Arena source code. If you don’t know what ioquake3 is here is the description off of their website.
You can totally get ioQuake3 for your latest operating system. It doesn’t matter if you play on Linux, Windows, or Mac. The UI is completely out of whack luckily there is an awesome updated Engine to allows you to modernize Quake III! All it requires is the baseq3 folder from the original quake III discs/install. It doesn’t support hi-resolution and just looks crummy. Quake III will run out of the box on Windows 10 but it doesn’t run well. Really all you need is the Quake III system files/data to be able to pull this off.