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Server 2019 Preview – ADPREP fails with “Failed to verify file signature: error 0x800b0109”

Today I have some time and wanted to upgrade my HP Proliant G8 Microserver running Server 2016 to the new Server 2019 Preview (build 17623). During setup I received the following message: "Active Directory on this domain controller does not contain Windows Server ADPREP /FORESTPREP updates. See https://go.microsoft.com/fwlink/?LinkId=113955." Okay, no problem, I thought I'd update the schema. I started a CMD shell as an administrator and changed to the support\adprep directory on the server 2019 DVD and entered the following command: [cc lang="batch"] adprep /forestprep [/cc] The command failed, I received the following error message in the log file: Verifying...