Button fails to activate

I am new to Sikuli and programming. I am trying to write a script to automate installing multiple programs on company / corporate computers. Following the successful install of a program, the corporate script (which auto runs on the corporate image when you install a program from the software center) generates a popup letting you know that program X was installed successfully. This popup has an OK button, that I am unable to get my Sikuli script to click.

When you manually hover over the button, it's background color changes, and the button "activates". No matter what I do in Sikuli, I can not seem to get the button to activate as part of my script. I am able to get Sikuli to successfully hover over the button, but the automated hovering in Sikuli does not activate the button...the button only "activates" (changes background color) the moment my script completes (tested with hover(button), wait(5)... and the button color changes when the script is finished / after 5 seconds, with no further mouse movement). I've tried click, doubleClick, mouseMove, hover, various combinations of wait, mouseDown/wait/mouseUp, etc...none of which work without the button "activated". Thanks in advance!