There is no software to sideload on your mac you're gonna need to use the shell (also known as command line). Try searching CrackBerry, adam did a great write-up sideloading on the mac. I'm too lazy to find the link for you.
just use terminal, it's CAKE, and you can actually see what's going on while you're doing it. nice, painless, efficient, and no need to install anything extra.
that assumes you're willing to install another google snooping device on your computer. and again, you're installing extra crap that the device can already do. Just use the terminal, it's **SIMPLE**