I have restored a backup I made before atempting the first upgrade and it had a similar error to the first time round
ERROR: Copy error
System.IO.DirectoryNotFoundException: Could not find a part of the path 'C:\DotNetPanel\Enterprise Server\bin\DNP.Common.Utils.dll'.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.File.InternalCopy(String sourceFileName, String destFileName, Boolean overwrite)
at System.IO.FileInfo.CopyTo(String destFileName, Boolean overwrite)
at DNP.Setup.FileUtils.CopyFileInternal(FileInfo sourceFile, String destinationFile)
at DNP.Setup.FileUtils.CopyFile(FileInfo sourceFile, String destinationFile)
at DNP.Setup.CopyProcess.Run()
at DNP.Setup.ExpressInstallPage.CopyFiles(String source, String destination)