private bool IsInstallerValid(string path) { X509Certificate2 cert = CertificateUtility.CreateCertificateFromFile(path); // // Only use Microsoft signed MSI if (cert.Subject.Contains("O=Microsoft Corporation,")) { var chain = new X509Chain(); chain.ChainPolicy.RevocationFlag = X509RevocationFlag.EntireChain; chain.ChainPolicy.VerificationFlags |= X509VerificationFlags.IgnoreNotTimeValid; return(chain.Build(cert)); } return(false); }