There is no installation required to get the HTSrunning 24/7 on macOS. All you have to do is download the AllPlatforms.zip package, unpack it into a folder and then unpack the contents of osx32.zip to /Applications/.
When you start HTS a script will run to check if you have Mono installed. If this is missing it will advise you to install it first.
When you start HTSit may take a few moments to initialize, this is normal. After a few moments, your browser will open to http://127.0.0.1:8090/.
It is rare, but there might be a small conflict with your browser that prevents it from opening automatically. If, after a few moments, the browser doesn't open automatically, manually open the browser and navigate to the URL: http://127.0.0.1:8090/
Remember that you will need to restart HaasOnline Trade Server if your machine has been restarted or shutdown.