Create two major upgrade items, one for each of the old products. Then when you get around to upgrading the new product, you'll need another major upgrade item for its new upgrade code. ... View more

What type of installation is the old Wise one? If it was an MSI, you should be able to uninstall it from your MSI built with InstallShield simply by setting up a major upgrade. Why don't you want to use that functionality? ... View more

You should be able to put it in the merge module, but be aware that the property name will have the MM GUID appended to it in the main project. (This is done by design so that items in the MM cannot overwrite items named the same in the main project.) So you need to do one of two things: either append the GUID to the property name in your condition check in the main project, or go into the direct editor in the merge module and remove the GUID from the property name wherever it appears. Personally, I'd use the GUID in the condition check to ensure that you never accidentally overwrite a main project property if you end up using the MM somewhere else. ... View more

I suspect what you're running into is the following: I have found that even though you have scheduled the RemoveExistingProducts version early, the costing that happens marks the component with your badly-versioned file as not needed due to having a higher-versioned file on the system. Then the uninstall is run and the older dll is removed. Then the install runs, but that component is skipped. You can verify that this is happening by logging the install and checking the states for the component in question. I believe you can overcome this, since you are completely uninstalling the older version first, by changing the component code on the file in question. then the install will see it as new and mark it for installation, the uninstall will remove the old file, and the install will install the new file as part of a new component. (If the RemoveExistingProducts action was scheduled after the new version is installed, this wouldn't work.) ... View more

I believe what you're seeing is the dialog displayed when the MSI is not signed. You might want to check out the information about using digital certificates to sign your MSI. ... View more

I'm a little confused. The standard behavior of an MSI is to show the maintenance dialog if that version of the MSI is already installed. Are you talking about showing the maintenance dialog if you're doing a major upgrade? ... View more

You might want to do some research into the way Windows 7 implements file protection. I'm not sure it will allow you to delete files from the system folder. ... View more

Is an MSI one of your requirements? It seems to me that what you are trying to do might be easier with an InstallScript project, especially since it doesn't appear that you need to use all the built-in Windows Installer features that manage upgrades, repairs and uninstalls. ... View more

You might want to try adding a system search for the registry key, so that you can save its value and write that value back when the key is re-installed. (You could also access the key through InstallScript if you'd prefer, or if you originally write the entry through InstallScript.) ... View more

First thing you may want to try is to look at the server install with a tool like Microsoft's Orca to ensure that the merge module files are included as you expect. Second thing would be to run the server install with logging to see if the log file shows why the files are not being installed. ... View more

IS automatically adds the merge module's GUID to any property created in the merge module, to prevent properties in the main install being overwritten by accident. You should be able to set the merge module property specifically by setting, for example, "PrCode.GUID" in your main install. ... View more

Have you tried running the install with a log file to see if it gives you any explanation as to why the action is not running? ... View more

Try running a log file on the uninstall and see it that will tell you why the folder isn't being uninstalled. ... View more