hi all,

it's been a while, which means wix has worked great for us for a long time
now, but just recently we've hit a weird one:

we're providing regular upgrades packaged as msi's bootstrapped in an exe.
(the exe places the msi into windows temp, and invokes the lib equivalent
of msiexec /i blahblah.msi reinstall=all reinstallmode=vamus. (product and
upgrade codes are persistent across version, we change the package id -
there's only one package... and this has worked for years now).

we've recently started seeing incidents (on win7 mostly), where running the
installer of newer version would not replace files with the newer versions
contained in the msi. details: suppose msi version 1.1 of the product was
installed, which correctly deployed version 2.4 of file blahblah.exe to the
program folder. trying to install version 1.2, which contains v2.5 of
blahblah.exe (with the proper upgrade options mentioned above), the
installer runs (interactive ui clicked through with nexts) displays all the
usual (removing existing, copying new files, publishing product...), but in
the end the program folder still contains v2.4 of blahblah.exe.
- a restart does NOT help
- files and their versions are verified (used orca to make sure), double
and tripple checked.
- also did all tests manually (through msiexec command line), same results.
- we can't pin the behavior to specific versions or specific workstations,
it just happens. we've reproduced by going through versions, and at some
point it would just happen, not always between the same versions.
- even if i manually delete v2.4 exe and then run the 1.2 installer that
should deploy v2.5, from some magical cache winstaller still manages to
conjure v2.4 instead. it's mind numbing
- of course manually uninstalling the older version before installing the
new one works, but is not an acceptable workaround (ad deployment, grumpy
users, etc...)

any thoughts on what could be causing this? what are we missing? where to
look?

thanks to all in advance.

cheers,

joe
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