If you're looking to Download FTP Server on your Chromebook laptop Then read the following guideline.

FTP Server provides a simple way to share/exchange files between your computers and other devices. * Ports below 1024 are supported now (including port 21). FTP(File Transfer Protocol) is a standard network protocol used to transfer computer files from one host to another host over a TCP-based network, such as the Internet. FTP Server lets you run the FTP service on your own computer and you can access the files on the host computer with any standard FTP client such as FileZilla or WinSCP. OS X provides read-only FTP access in Finder, you can press Command-K in a Finder window and enter the FTP URL (something like ftp://192.168.0.100:2121/), and connect to FTP Server. FTP Server comes with its own authentication, you don't need to expose your computer accounts to other people nor do you need to create a system user for the authentication purpose. * Features • Easy to use: you can simply start the FTP service without any additional configuration. • Configurable: server root, port, anonymous access options are available. • Built-in authentication. • Lightweight: FTP Server requires very little resources to run. • All kinds of regular files supported: folders, documents, photos, movies, apps, backups and other files. * Please restart the FTP service after changing the FTP Server settings. Note: The default document root points to "/Users/*username*/Library/Containers/net.langui.FTPServer/Data/Documents/FTPShare", you can press Command-G in Finder to go to destination folder.