[sunburst79]

I don't own Express so this is all a guess.

I'm assuming there's a plugin folder. You might get this working by installing the the AIR Virtual instruments collection. But....I'm fairly sure that you cannot add those plugs to Express (however I may be thinking of PTSE).

If running the installer doesn't work than you might try copying the relevant .dpm or .aax files from your plugginfolder to his.

Barring that you can just bus the current Vacuum track to a Audio Track and record it. While its not ideal since he will have to fly the session back to you for any changes to the vacuum track it will let him work with the session