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Please open the project in Visual Studio Community Edition 2019 then find the following lines from the ReportConversionAddIn\ReportConversionAddIn.csproj. You may comment out or delete following lines and save the file then Visual Studio Community Edition 2019 prompt you to reload the project configuration. Please confirm the reload. After that it will be automatically recreate the ManifestCertificateThumbprint. Hope it will fix your signing issue.
<PropertyGroup>
<SignManifests>true</SignManifests>
</PropertyGroup>
<PropertyGroup>
<ManifestKeyFile>ReportConversionAddIn_TemporaryKey.pfx</ManifestKeyFile>
</PropertyGroup>
<PropertyGroup>
<ManifestCertificateThumbprint>A1FE05DDA1DF10BA23B874A26E7BDF224282D192</ManifestCertificateThumbprint>
</PropertyGroup>