We have a guide page regarding Windows installation issues: https://wiki.documentfoundation.org/Faq/General/General_Installation_Issues_(Windows let's arrange it so that if the Windows installer fails with our MSI, the user gets a message suggesting they visit that page.
Code pointers: 1. MS documentation on the error dialog [1] 2. MS documentation on Hyperlink control [2] 2. ErrorDialog property [3] 3. SetupError dialog in instsetoo_native/inc_openoffice/windows/msi_templates/Dialog.idt 4. Respective controls in instsetoo_native/inc_openoffice/windows/msi_templates/Control.idt and instsetoo_native/inc_openoffice/windows/msi_templates/ControlE.idt [1] https://learn.microsoft.com/en-us/windows/win32/msi/error-dialog [2] https://learn.microsoft.com/en-us/windows/win32/msi/hyperlink-control [3] https://opengrok.libreoffice.org/xref/core/instsetoo_native/inc_openoffice/windows/msi_templates/Property.idt?r=b17d6452#22
While at that: you could think how to make that page make it clearer that this is an error. We had questions because people didn't notice it tells about an error, and thought it succeeded, and then were confused seeing there's no results / unexpected result.