How to install Appointments+ via WP or cPanel?

I've looked over your installation page and I don't use any of them.

Normally I buy a plugin, download a zip file and install from WP plugins in my dashboard, but can't seem to get that to work.

I tried dragging the folder into my cPanel plugins folder, but that didn't work either.

I only use WP or cPanel to do anything with my site. Don't use FTP, so how would I install this plugin? Thanks!

Charly

Mac OS X 10.6 (up to date)
WP 3.8.4
Bluehost cPanel