This is a GUI which allows you to create and upload packages!
To download a package you need to download the jar file, make a new directory, then make another dir that should be called "packages"
Run the jar file. Maximize window. Then search for a package (one package i have made is called express4java which is basically a web server.)
If you don't see any buttons popping up as you searched for a package, then unmaximize and maximize again.
press the button(s) to install the package
javac -cp packages/* <file(s)> javac -cp packages/* <file(/s)>