if you dont have internet at home, why would you get a multiplayer-based game anyways?
Its still a single player game.
I havent tried it though, but its very very easy.
1. Start up Stardock central where you have an internet connection
2. Find Sins, right click it, hold the mouse over Archive Application, then click the "Download and Archive.
3. When its done downloading, find the Archived file usually located at "C:\Program Files\Stardock\SDCentral\BACKUP\"
4. Then add the archived file and the Stardock central install file, to a CD/DVD, USB dongle, memory stick or what ever you like.
5. Go home, install Stardock central and install the game
Theres always the DVD option