Arduino 1.5.4 and Tiny AVR Programmer

Has anyone managed to get the Arduino 1.5.4 to find the Tiny chips under Tools>board? I cannot!

Core?

Core what?

To have support for ATtiny processors you have to install a "core". Which one did you install (where did you get it)?

I'm not sure what you mean by 'core' but this is what I have.
Arduino 1.5.4
usbtinyisp w32 driver v1.12
attiny downloaded from GitHub in the hardware directory of my Arduino IDE.

I also have the Atmel Studio 6.1 and the Atmel STK600 that seem to work fine. I use that for the ATMega2560 programming.
I also have MS Visual Studio 2012 and Visual Micro that I use to program my other Arduino boards.

What else do I need?

James-Brown:
attiny downloaded from GitHub in the hardware directory of my Arduino IDE

URL?

Doesn't work for me either. I suggest using 1.0.x instead.

URL on that one?

I see what you mean. I reverted back to vers 1.0.4 on the Arduino IDE and the tiny's all show up.
I think I'll switch back to 1.04 for what I do for a while. 1.5.4 causes me to many problems.

That was the trick.
Thanks Badly...