bin/ExSMIME.dll Copy Error During Exchange Patching

I have seen a lot of this, and there are some documents online but none that described what I was seeing. I was getting the following on an upgrade of Exchange 2013 CU10 to CU22 (yes, a big difference in versions):      The following error was generated when “$error.Clear();           $dllFile = join-path $RoleInstallPath “bin\ExSMIME.dll”;           $regsvr = join-path (join-path $env:SystemRoot system32) regsvr32.exe;          start-SetupProcess -Name:”$regsvr” -Args:”/s `”$dllFile`”” -Timeout:120000;         ” was run: “Microsoft.Exchange.Configuration.Tasks.TaskException: Process execution failed with exit […]