You can indeed download the latest version on another machine and transfer it, though it'll take a return trip to activate the offline install by email. Here's how to get the download version of the game or the patch for a retail copy up and running on an offline machine (It seems like a lot, but it's basically a couple clicks, wait for download, copy and install once you're registered and have SDC installed):

1) Install SDC on an online machine (keep a copy of the SDC installer handy).

2) Log in on SDC, head to the Games section, right click on the game, and choose Archive Application->Download and Archive. If the game is already installed and updated on this machine you can choose Archive Application->Selected Application to pack it up without redownloading.

3) If the game has modules (GalCiv2 does, for example), you'll be prompted to archive them as well. If the media you'll use to transfer the game isn't large enough, you may need to decline and archive each module sparately; otherwise just say yes.

4) When the archive process finishes, you'll find the .sdc file(s) in C:\Program Files\Stardock\Stardock Central\BACKUP (this path is customizable in SDC's settings so it may vary). Copy the .sdc files along with the SDC installer to the portable media of your choice (CDR, DVDR, USB drive, etc).

5) On the offline computer, install SDC, then double-click the .sdc archive files in explorer to unpack them.

6) Run the game; you'll be prompted to activate. Enter the appropriate information and attempt to proceed; it will fail and offer you an option to activate by email. Copy the subject line and mail body it provides and get them back to the connected machine; email them off as directed, and follow the instructions in the reply to complete the activation process.

*bump*

Hilariously, this didn't work. I was prompted to activate, but when I entered my serial, I got an error message stating that the serial was an invalid length. What do I do now?

Thanks, I'll give it a try. I hope support is as quick as you've been!