Wix, custom dialog when previous version exists

Question

I\'m making installation for my application with WiX toolset. I want to show custom dialog if previous version found.

Now I don\'t know how to check if there is pre

Answer 1

Next / Back Button Override: I am no GUI expert, in fact it is a neglected area (GUI is always suppressed for corporate deployment), but I believe something like this can work - redefining the Next and Back buttons - 3 dialogs involved:

<!-- 1. OldVersionDlg showing -->
<Publish Dialog="LicenseAgreementDlg" Control="Next" Event="NewDialog" 
         Value="OldVersionDlg">LicenseAccepted = "1" AND PREVIOUSVERSIONSINSTALLED</Publish>

<Publish Dialog="SetupTypeDlg" Control="Back" Event="NewDialog" 
         Value="OldVersionDlg">PREVIOUSVERSIONSINSTALLED</Publish>

<!-- 2. OldVersionDlg dialog not showing -->
<Publish Dialog="LicenseAgreementDlg" Control="Next" Event="NewDialog" 
         Value="SetupTypeDlg">LicenseAccepted = "1" AND NOT PREVIOUSVERSIONSINSTALLED</Publish>

<Publish Dialog="SetupTypeDlg" Control="Back" Event="NewDialog" 
         Value="LicenseAgreementDlg">NOT PREVIOUSVERSIONSINSTALLED</Publish>

Actual Dialog Sequences:

1. LicenseAgreementDlg <-> OldVersionDlg <-> SetupTypeDlg

2. LicenseAgreementDlg <-> SetupTypeDlg

To be sure, remember to test in all installation modes: install, upgrade, repair, modify, patching, uninstall (and there are stranger shores such as resumed installs - rarely seen).

In closing: is this feature really necessary? I find that features like these often cause more bugs than benefits, but that is just a personal opinion. In fact I wrote an answer a long time ago on how to implement such an upgrade check without using setup dialogs.

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Some Links:

• Changing text color to Wix dialogs (Customizing WiX GUI)
• Wix default folder dialog