It’s the certificate information on the certificate used in the msi installer package. While this certificate indeed in the meantime has expired, also note that it wasn’t expired at the time of the signing (Monday, 8 February 2021 15:24:20) and as such still should be considered a valid certification check for the signature (which is the case on my Win10 laptop).
We will not re-package a new 3.6.2 installer as all focus is on the upcoming MuseScore 4 release.
Note: You’ll notice that if you download even older versions/installers they’ll come with even older certificates. Again though, as long as the time of signing matches the validity range of the certificate, all should be just fine.
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