If you are setting ARPINSTALLLOCATION with a custom action (type 51 usually), 
you might need a condition on it if it's unconditionally setting 
ARPINSTALLLOCATION to a value that is not recomputed at patch time. You'd only 
set it if "Not Installed". 
I've also seen people write a small custom action to get the install location 
using the Msi APIs and set the source (TARGETDIR?) when the product is already 
installed. Sometimes that's necessary for other custom actions that need to 
know the install directory during a patch as well as during a fresh install. 

Phil Wilson 


-----Original Message-----
From: Alex Ivanoff [mailto:alex.ivan...@shavlik.com] 
Sent: Friday, February 19, 2010 11:40 AM
To: General discussion for Windows Installer XML toolset.
Subject: [WiX-users] ARPINSTALLLOCATION and patch

We use ARPINSTALLLOCATION to set InstallLocation in uninstall key. We just ran 
into an issue where applying a patch clears out InstallLocation. Is there 
something special we need to do?
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