installer - How to show pop message before majorupgrade -

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how show pop message user wants upgrade new installer or not before major upgrade.

i tried majorupgrade element, able downgrade custom actions not major upgrade.

if using majorupgrade element wix_upgrade_detected property defined when upgrade performed. can define new dialog or pop-up in ui based on property. you'd need modify publish element want put ui so:

<publish event='showmajorupgradedialog'>wix_upgrade_detected</publish>

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