problem with upgrade

Hi,

We have been using wise until lately. Our product consist of a client that checks at times for a new version on a server.

The following line has been harcoded on the client side:

msiexec /I httpPathToMymsi.msi REINSTALL=ALL REINSTALLMODE=vomusa

Which is a mistake because basically when a new version is available on the server, all this does is reinstall by using the new msi available. The product code is never changed. This is not the correct way of doing an upgrade.

Now I come into the picture and I am asked to migrate this setup to Installshield. We have few new modules and I am unable to replicate the same behaviour as before:
->with the same productId the setup fails to upgrade and do not update any files, does not install the new files.
->with a new productId, the old application is not removed.

Any ideas appreciated.

zakaria

Glytzhkof