Key Features

This will be an unordered list of changes made to the code, major or minor, that hasn't already been mentioned and affects the game in any way. Some of these changes were not made by me but by other developers and those changes will be pointed out by either their name or his initials.

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.

You will only need to install content separately when not using the Windows installer

Windows [Manual]

Copy the uqm-0.7.0-3dovideos.uqm file to your addons directory. Which by default is

C:\Games\The Ur-Quan Masters MegaMod\content\addons\

After that you can load the MegaMod and opt to use the 3DO videos instead of the PC slides in the settings menu.

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macOS

Right click on the MegaMod app and select Show Package Contents
Navigate to Contents -> Resources -> content -> addons
Move or copy the uqm-0.7.0-3dovideos.uqm file into the addons folder.

After that you can load the MegaMod and opt to use the 3DO videos instead of the PC slides in the settings menu.

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GNU/Linux (Debian based)

¯\_(ツ)_/¯

To be honest I don't know of a decent, safe, and streamlined way to do this. How I do it is that after installing the Debian-MegaMod.deb I load the file explorer with root privileges and force copy the content over to:
usr\share\games\uqm-megamod\content\addons\