Vanilla Sins Install:
Extract the zip to the root directory of Sins of a Solar Empire. ie: $:\Program Files\Stardock Games\Sins of a Solar Empire

Entrenchment Automated Install [assumes install in "Program Files"]:
1: Extract files to local path
2: Run install.bat for 32 bit flavors and installx64.bat for 64 bit flavors 

Entrenchment Manual Install

1: Extract the zip to the root directory of Sins of a Solar Empire. ie: $:\Program Files\Stardock Games\Sins of a Solar Empire
2: Make the following edits to "galaxy.manifest" which can be found in $:\Program Files\Stardock Games\Sins of a Solar Empire\Entrenchment
	i: Add 4 to whatever your fileCount is, ie: 40 -> 44
	ii: Append the following to the bottom
		fileName "Threeway"
		fileName "Diamond in the Rough"
		fileName "Lucky Clover"
		fileName "Pleiades"

I lurk the sins forums so if you have a problem with any of this PM me on the official sins forums @ "Dr.Gonzo"

-Gonzo

Note:
$:\ is my way of saying "whatever drive you installed this to", please don't try looking for "$:\Sins of a blah blah"
and tell me that it doesn't exist. You probably know this already, but for the inept, I've added this tidbit of knowledge.