Take a verbose log and see what it says around any FindRelatedProducts actions. 
I think you'll find that some CRT MSMS explicitly specify an ALLUSERS=1 value 
to force per-system installs, and you may have been all per-user previously. 
The cross-context upgrade per-user to per-system won't work. 

Phil Wilson 


-----Original Message-----
From: cov753 [mailto:cov...@gmail.com] 
Sent: Thursday, January 06, 2011 6:56 PM
To: wix-users@lists.sourceforge.net
Subject: [WiX-users] The earlier version can't be detected by major upgrade


I use the different Product Id,Package Id and the same Upgrade Id. 
In the past few days, it works perfectly. However, when I add a CRT .msm
file in my installation package, it could not detect the earlier version
that I have installed. If I remove the msm, the earlier version will be
detected. 


Any one have any suggestions? 

Thanks!
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