Years ago my employer released a new version of their desktop app. Occasionally, under certain versions of Windows, it would complain and show a dialogue box d

Years ago my employer released a new version of their desktop app. Occasionally, under certain versions of Windows, it would complain and show a dialogue box during the installation process. We needed to hit a release date (yes, it was our own fault - we didn't have time to deal with the error message in the installer) so on the upgrade instructions, on our website, we added "you may see a box like this [screenshot] - just click the OK button, the box will close and installation will continue". A couple of days later we had a call from an exasperated customer - "I keep clicking OK but the box won't go away". After an hour of talking we finally figured out that he was clicking the OK button on the screenshot on the webpage and hadn't even started the upgrade process.