I'm in the process of building a new DAW and as I have very limited web access, I'm hoping there is some way...

I'm sure I have to download the program itself and activate it for the new machine (2 activations permitted)...

Sadly I don't think there is, but I'm hoping.... ;-)

<whew> I forget how many items are involved to get my DAW where it's like home...

In the XLN online installer there is a place to declare the location of the samples. Either change that before you install or if you have installed it already move the content and then change the installer to the new location so that further updates will go to the right place.