Of what I understand and trust me I've tried many things, there is NO way to install a Stardock Product (I am, myself, refering to Galactic Civilization 2), completely offline to a new computer.
You can try to use archive and then you wont be able to get impulse running because you have to register over the net.
You can try what's in that thread and download from impulse anywhere but even then, when you install the product to the new computer you will still have to revert to a computer with internet so you can have a VALID activation response.
I have to say I bought products from stardock in the past but I HATE how you have to register avery time you try to play what you honestly paid for. There SHOULD be a way to download what you need once and for all and never have to go back to Stardock to play what you, again, PAID for...!
What will happen in ten years when there is no more support for the stardock products or if they go out of business? I wanted to pay for those products because I felt they were worth it and I would not have to hack to play them but now I feel I have to revert to hacking to play the product how I'd like to play it....!
Anyone can help and provide a way to completely install the product in an COMPLETELY OFFLINE WAY?