John Tiller Software is born--Digital Download

[jomni]

Based on what is written in the OpsCampaign section, you can make a copy of the folder and do all the modding there.

If you have to uninstall so you can use it on a 3rd computer (since you get 2 - one for a laptop and one for your main) it will uninstall the vanilla install and leave your mod folder alone.

The mod will count as 2nd activation?