Andrew McLaren

Short answer: I dunno :-) But ... Office caches its setup files on the
local hard disk; normally you don't actually need to CD-ROM to find setup
files. Set folder options/view to show hidden and system files and folders.
Then look for a folder named MSOcache, and open it at this folder:

C:\MSOCache\All Users\90000409-6000-11D3-8CFE-0150048383C9

and you should hopefully find the cab you need (remember to turn hidden
files OFF again, when you're finished - they are very distracting).

Other folks might have better info; hope this helps a bit.
Andrew