New Post: Custom/External UI on Uninstall

Hi vlad_ss,

I've managed to get it working. (Although it's a very hacky solution :-s)

To stop the ARP-session, I'm using a MangedAction:

new ManagedAction(
    nameof(Setup.CallPrettyUIWhileUninstall), 
    Return.check, 
    When.Before, 
    Step.InstallInitialize, 
    Condition.Installed)

Body of the action:

[CustomAction]
public static ActionResult CallPrettyUIWhileUninstall(Session session)
{
    // Call pretty setup... If it could not be located, the default 
    // uninstaller will continue to run
    // 
    // Note: Additionally the running processes are checked to determine 
    // if the current setup is already the pretty one..
    var setupPath = "[Path to your Setup.exe]"
    if (System.IO.File.Exists(setupPath) && 
        !Process.GetProcessesByName(
            Path.GetFileNameWithoutExtension(setupPath)).Any())
    {
        // --> Start pretty setup
        Process.Start(SetupParams.SetupPath);
        Environment.Exit(0);
    }

    // Either the setup could not be located or it's already running
    return ActionResult.Success;
}

Please let me know If you've found a better solution.

Best regards