While closing one bug (“wixforme”) I ended up opening another:
http://wixtoolset.org/issues/4445/
Let me prefix this by saying that “UpgradeCode” is ill-named and often
misunderstood. First of all, as many on this list know, just having the same
UpgradeCode doesn't make an upgrade (I probably get asked that question once a
week). But the associated actions don't even mention upgrading. In fact,
FindRelatedProducts is really what puts UpgradeCode into perspective: it just
finds any products with UpgradeCodes mentioned in the Upgrade table.
Internally when we wrote util:ProductSearch/@UpgradeCode it was intended and
does find the highest version installed (since the search results are singular
currently). I recommend doing the same thing with public WiX but wanted to hear
what others think. I don't consider this a breaking change. If setup devs are
using a chain of major upgrades then they'll still find 0 or 1 installed
products, but for setup devs that might use UpgradeCodes for relating products
they'll get the same type of results they would with internal WiX.
- Heath from his Surface Pro
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