After upgrading your computer to a new DOS version, an older application displays the error message "Incorrect DOS version". What should you do to run this application?

In computing, ver (short for version) is a command in various command-line interpreters (shells) such as COMMAND.COM , cmd.exe and 4DOS/4NT. It prints the name and version of the operating system, the command shell, or in some implementations the version of other commands.