Well, the error message
Code:
is not recognized as an internal or external command, operable program or batch file.
clearly means that the command line interpreter (cmd.exe usually) either cannot find "C:\Users\Alone\Desktop\RipBot264v1.25.1\EncodingClient.exe" at this location or believes that it does not look like an executable inside.
IMHO, putting an application into a directory on the desktop is not recommendable (also note that if you use several user accounts, another user's desktop may not be accessible), and using complex folder names with version numbers and many dots neither (also I noticed in your screenshot that you are running v1.26.0, but the path contains v1.25.1). Better create a short directory right in a drive's root (like "D:\RB264"), that decreases the risk of typos in the application's path a lot.