I have some sequential MSIs, say p1, p2, p3, p4 and want to make MSP patch. Based on some test, it seems that it's enough to make a patch between only p1 and p4 to apply the patch to any package between p1 and p4. Is this right, or should I make muliple targetted(p1, p2, p3) patch?
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So far I only created patches that have all versions (p1, p2 and p3) as targets, to make sure they are all supported. I don't understand how would Windows Installer see them compatible if p1, p2 and p3, have different product codes. Or you have kept the same product code for all of them?

Bogdan Mitrache
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They have the same product code, but different package codes. – David Johns Aug 14 '13 at 14:26