the signature of REDDOXX-ANTI-RANSOM.msi is broken or invalid

The internet explorer with enabled smart screen filter reports, that the signature of REDDOXX-ANTI-RANSOM.msi is broken or invalid.

This is a misinterpretation of internet explorer.
The signature can manually be checked in the downloaded MSI via rightclick -> properties -> digital signatures -> details.
When the signature is reported as "The digital signature is valid", the MSI can be installed without any concerns.