Hello Boisforas,
Just a quick question to get an idea what you're trying to do here. Do you want to install 1.03 explicitly. Or 2.02?
Either way, all UPDATEs are all-inclusive, all you need to do is just install the update you want on top of the original 1.00 (1.01 depending on your disc) that is the original purchased version.
Regardless which one you want to install, here's the links to all of them: >>
LINK <<
If it is 2.02 you want, I'd suggest just install the original 1.00 from disc, then click at the Check For Updates button in the game launch window, and let the installer kick on. Just follow the instructions on the screen.
As for folders, it might be that W10 (W8.1 for that matter as well) wants to point to Microsoft OneDrive folder when Open or Save is first time performed. You need to navigate to C:/Matrix Games/John Tiller's Campaign Series/West Front (or East Front, Rising Sun depending on which game you've got). Once you've done it, W10 accepts that's the location for saves and opens.
Hope this helps!