I've also seen this behavior during upgrades. The source MSI always need to be available, whether we like it or not, because you can't tell when this can happen.
A typical scenario during upgrade is that RemoveExistingProducts is sequenced early. The upgrade therefore needs to apply versioning rules to see if the incoming file should replace the existing one. If it turns out that the version on the system does not match what it's supposed to be from its source MSI file, then the only way that Windows can figure out whether to replace it or not is to ask for the original source MSI for that older product version, install the file, and then see if it should be replaced. There are more straightforward reasons however, like an inappropiate ResolveSource action during the uninstall of the older product. Verbose logs should tell you what's going on. Phil Wilson -----Original Message----- From: Pally Sandher [mailto:pally.sand...@iesve.com] Sent: Thursday, November 04, 2010 11:01 AM To: General discussion for Windows Installer XML toolset. Subject: Re: [WiX-users] upgrade requesting location of previous MSI Is the upgrade shipped as an MSI or an MSP? I've seen that happen with MSP's when doing stuff like deleting files from the new version without authoring an appropriate RemoveFile. If it's an MSI are you using a bootstrapper to deploy it or just the raw MSI? Palbinder Sandher Software Deployment & IT Administrator T: +44 (0) 141 945 8500 F: +44 (0) 141 945 8501 http://www.iesve.com **Design, Simulate + Innovate with the <Virtual Environment>** Integrated Environmental Solutions Limited. Registered in Scotland No. SC151456 Registered Office - Helix Building, West Of Scotland Science Park, Glasgow G20 0SP Email Disclaimer -----Original Message----- From: John Lalande [mailto:johnlala...@gmail.com] Sent: 04 November 2010 17:37 To: wix-users@lists.sourceforge.net Subject: [WiX-users] upgrade requesting location of previous MSI I have been unable to recreate this issue here, but I am getting reports of users attempting to upgrade to the next version of our product getting a dialog to browse to the location of the previous version's MSI file, which is no longer where the installing user had it. This is causing the upgrade to fail. Like I said, I am unable to reproduce this issue. But I have to find some way to resolve it short of delivering the previous version of our product with the upgrade. Does anyone know what might be causing this? 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