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it get's rejected because it's hosted on an insecure url and the windows smart screen kicks in on download.
Yes, publishing MSI or EXE apps requires a secure url for downloading.
Is there any alternative free hosting service where a version configured path to the .msi can be set up?
I have to say that this question is out of scope of Microsoft Q&A forum. Forum support can't give you suggestions about third-party service or tools.
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