Dynasties is a mod for Master of Orion 2. Techs are harder to research and defenses are strong, making games much longer. It includes O2M, a powerful modding tool.
Requirements:
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Master of Orion 2 DOS, fully installed (that is all the game files from the original CD must exist in the game folder) and patched up to version 1.31 or higher.
DOSBox
Dosbox.com
Download, unzip and run O2M.exe
If it fails to start, you may also need to install .NET 4.7.2
Dotnet.microsoft.com
Don't forget to activate Dynasties in O2M launcher or you will be playing the vanilla game.
The download only contains the o2m file and there is no dynasties mod in the launcher or installed anywhere I can find.