I found this link on the Roland UK site, and it does work and lets you download a working copy of the SMF Update App for updating your VS...

Hope that helps for anyone looking for this tool, as the links to the App in the various VS model specific areas seem to be all or mostly dead.
880EX, 3x 2480s, 2400CD, 1680, MV8000, MV8800, XV5080, S-550, MC909, Yamaha SY77, Korg M3R,