Open Excel on Terminal Server
Click on Add-Ins from the Tools pull down menu
Click on the Browse button
Browse to W:\SBS\Never
You should now see a list of the available Add-Ins:
Double click on the Add-In to be installed (Unfortunately you must install each of these seperately).
When prompted to copy the Add-In to the local add-ins folder click "no"
Repeat the process until all of the Add-Ins have been installed.