NB This tutorial is specifically for Star Trek Armada 3.
Nonetheless the priciple applies to most if not all Sins mods
Always read the README.txt file with any mod first.

• Sins Of Solar Empire Mods
• Gog Sins Of A Solar Empire Rebellion Redeem Code

There is a common bug within Sins of a Solar Empire that with some mods the in game feature to enable a mod wont work. To combat this alot of Mod Dev teams include a file and instructions to manually enable their mod before you launch the game.

Join Cpt Shack as he briefly explains how to install a mod for Sins manually using Star Trek Armada 3 mod as an example

Sins Of Solar Empire Mods

Gog Sins Of A Solar Empire Rebellion Redeem Code

Sins of a Solar Empire is a space-bound real-time strategy game in which players control one of three different races: the industrial TEC, the psychic Advent, or the alien Vasari. The playing field is a 3D web of planets and other celestial objects in the orbital plane of one or more stars.