If you are a registered user of Aaron or Greg's Buttons, you are entitled to register Kaleidoscope for the discounted price of $10. To get this discount in the "Register" program, click the "Aaron / Buttons Upgrade" check box. When this box is checked, the prices shown are the upgrade prices.
(I hate to mention it, but if you take this discount and are not a registered user of Aaron or Greg's Buttons, we will bill you for the difference.)
Before you install Kaleidoscope, you must disable Aaron and Greg's Buttons. Kaleidoscope includes an "Aaron" plug in Color Scheme that provides the same interface as Aaron, and Kaleisocope also duplicates most of the functionality of Greg's Buttons. To disable Aaron, just drag it out of the Extensions folder or disable it with your extensions manager. To disable Greg's Buttons, drag it out of the Extensions folder, disable it with your extensions manager, or uncheck its general "On" check box in the control panel.