Windows Store version may cause this issue.
It's mentioned again on top, always get Installer (64 bit) instead of Windows Store version on kodi.tv/download. If it still doesn't work:
Go to https://letsencrypt.org/certificates/ and download "ISRG Root X1", "ISRG Root X2", "Let’s Encrypt R3" (.der files).
If you can't locate those 3 files, download from here.
Import the 3 certificates in your local Trusted Root Certification Authorities, follow this guide for that:
https://www.sonicwall.com/support/knowledge-base/how-can-i-import-certificates-into-the-ms-windows-local-machine-certificate-store/170504615105398/
You may have to restart your system.
Another solution is to get a more recent windows version that has the latest certification versions, and install it.
Wizard gives a Certificate Verify Failed error - Wizard error - Windows
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