Aisc the only reason I called the board manager crap is because me and my friends hate it. BTW, what is the old way of installing? Before all I had to do was copy the attiny folder into my sketchbook and hardware folder and I was done. I tried doing that on the IDE and that didn't work.
Thanks guys and thanks DrAzzy for the links!
You copy the core to the hardware folder in your sketchbook - that's the right way. They fiddled with the directory structure though, so installing an old core that way will result in it not seeing it. You want it to look something like this (shown for my cores)
I sync the repo to my hardware folder with the github client - that's what I recommend if you're comfortable with github; that way, you can easily update it (both of my cores get updated frequently)