It'll be a bit tricky, but it is probably doable. It's just a bit awkward as the install package is optimised for use with the Arduino IDE board manager, so is harder to install manually.
Need some more information first... such as what operating system are you using? Windows, MAC or Linux? I can give you some instructions for Windows which should get you most of the way there, but you might still have to fiddle with a few things to get it fully working.
