Hi All,

Here is a scenario that i want to implement.but i don't have good idea to
implement this.

let's say that someone get a installer and install it today. tomorrow
someone get a new installer with the higher version number want to install
it on the same PC. the installer with the higher version need to do the
following things.

   1. there should have a dialog to let user choose which modules to
   upgrade.
   2. update those modules base on the user's selection, but don't delete
   other modules that user don't select.

i have tried use Majorupgrade element to implement this. but it always
delete the modules that we don't select. see below:

for example .in the previously version we selected *feature A* and *feature
B* to be installed. and in the new version we only choose *feature A* to
update. the *feature a* was updated successfully , but it deleted the
feature B at same time.

Is there anyone have a good idea to implement this?

Thanks in advance!
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