Yes I can see the problem. You have healbot installed under a directory called Healbot_1. As I understand it, the directory structure should be the same as Windows.
Healbot should be installed in the Addons directory. You should be able to "grab" the healbot directory line and move it over the addon directory. It should move the directory (and the files and subdirectories) to there. WoW will recognise the healbot addon then.
Hope I am right
I'm somewhat confused. This is the current (retail) forum. The healbot screenshot version is for the Classic version.
You must install the right version of the addon that corresponds to the WOW version.
Hope this helps :-)