Hi, @DukenTee
Thank you for posting in Microsoft Q&A forum.
If you do not have the file md4es.msi under "C:\Program Files\Microsoft Configuration Manager\CMUClient\x64", you may copy the file from "C:\Program Files\Microsoft Configuration Manager\Client\x64"
For your reference:
https://techuisitive.com/management-point-installation-failed-after-sccm-2303-upgrade/
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