There is no installation required to get the Haasbot running on MacOS. All you have to do is download the package and unpack the OSX version to a location which is good for you.
When you start the Haasbot then a little script will run which will check if you got Mono installed. If this is missing then it will give advice to install it first.
When you start the Haasbot then its to be expected you will see nothing at first. But after a few second your browser will open at http://127.0.0.1:8090/ and it will show the Haasbot.
It is very rare, but if this does not happen then there might be a small conflict with your browser. To check this the advice is to open the browser and to enter URL: http://127.0.0.1:8090/
Setting Up Haasbot
Now you are ready to Enter your license key