Thanks Ben
Just getting back to this...
Ok I've created the MST again making sure it was the last thing I checked then saved the MSI again.
Here is the command line:
msiexec /i \\FILE0\Blue\Public\Software\Adobe\Reader\AcroRead.msi TRANSFORMS=\\FILE0\Blue\Public\Software\Adobe\Reader\AcroRead.mst
Whilst this cmd brings up an interface to repair my version, the MST is supposed to make it silent. Is that at all possible?
Regards
Peter