For Windows it's as easy as downloading and running the installer file.
For macOS you will download the MegaMod .dmg file, mount it, then copy the app to wherever you'd like.
For other systems you'll have to download the source code and compile it yourself.
During the installation the install wizard will show you a list of optional contents with checkboxes next to them. When checked the installer will download the optional content and install it for you.
For these examples I will be using the 3DO videos package but this works for any of the content packages. To start, download the 3DO video package on the Downloads page and make note of where you downloaded it.
uqm-0.7.0-3dovideos.uqm file to your
addons directory. Which by default is
C:\Program Files\The Ur-Quan Masters\content\addons\
C:\Program Files (x86)\The Ur-Quan Masters\content\addons\ in 64bit Windows
After that you can load up UQM and opt to use the 3DO videos instead of the PC slides in the settings menu. Make sure you restart UQM after you choose to use the 3DO videos so that it loads them properly.
Right click on the UQM app and select
Show Package Contents
Contents -> Resources -> content -> addons
Move or copy the
uqm-0.7.0-3dovideos.uqm file into the