Cannot get Board Manager to show the microcontrollers attiny84 and 85

Have followed instructions to the letter but still no luck. I get an error that says "error in downloading http://drazzy.com/package_drazzy.com_index.json and the board manager shows only the initial items which came in the IDE download.

I am trying to use the Arduino Uno to program the attiny 84V, 85. Is there a different board URL for this function?