When .NET Framework 4.7.2 was released (April 2018), Microsoft signed it with a SHA-2 certificate issued from a newer root authority. However:
Thus, when you run the installer, Windows checks the signature, tries to build the certificate chain, fails to find a trusted root, and throws the error: "The certificate chain was issued by an authority that is not trusted." net framework 4.7 2 windows 7 certificate chain error
Microsoft ended mainstream support for Windows 7 in January 2015 and extended support in January 2020. The certificate chain error became rampant after mid-2021 when Microsoft migrated most SHA-1 signing to SHA-2 and updated their root certificate programs. Many IT professionals had to re-visit old Windows 7 machines exactly for this reason. Thus, when you run the installer, Windows checks