MSI doesn't support concurrent installations. Although MSFT says it's a
"deprecated" feature, it's so full of trapdoors that's it's never been fully
supported at all IMO (after extensive work with it).
In my experience a merge module is really the only way to do it. Most
3rd-party products don't provide one however should you need to install it
with your own product. In any case, MSI is very difficult to work with and I
wouldn't recommend it for anything beyond the simplest applications
(unfortunately, there's little else to rely on that's any better).
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