We have just been working on implementing UPGRADES to our products. In the past we always included the release number in the product ID and install path and changed the GUID for each release. for various reasons we now want users to be offered UPGRADE as a possibility and to be able to distribute differential media.
What seems to be the case is a change in the leftmost digit groups does not cause upgrade to be offered, so 1.02.03.004 to 1.02.03.005 offers the user the MAINTENACE UI not the UPGRADE UI. Changing from 1.02.03.004 to 1.02.04.001 does offer UPGRADE. Is there a work round for this bug as we would like UPGRADE to be offered for all version increases. Currently I have worked around this by modifying the MAINTENANCE UI to offer REPAIR as a default and to disable MODIFY.
This is actually not much of a problem to us at the last digit groups is normally used in house only.
Quite a serious limitation of Windows Installer I think! Still it should not cause us too much problem in the field I think. Thanks for confirming that.
