"startup.bat' is not recognized as an internal or external command" is an error message that typically appears when you try to run the "startup.bat" file on a Windows operating system. It means that the system cannot find the file or command you are trying to execute.

There are a few possible causes for this error:

The "startup.bat" file is not located in the correct directory. Make sure that the file is in the correct location and that you are running the command from the correct directory.

The file name is incorrect. Make sure that the file name is spelled correctly and that the file extension is ".bat"

The file is not associated with a program that can execute it. Make sure that the ".bat" files on your system are associated with the Command Prompt or Windows PowerShell.

The system environment variable Path is not set properly. Make sure the directory containing the startup.bat is included in the system environment variable Path

The file may be corrupted or damaged. Try to download it again or get a new copy of the file from the source.

Try the above solutions and it should work.