Hello @intruder82,
Is it enough to just download this bundle and overwrite in the addons folder or do I need to do something more?
You can download the latest addon zip file from here. Then extract the DSC Alarm Binding and DSC Alarm Action JAR files to your openHAB addon folder. It will not overwrite your current binding version, because the name is different, so you will need to remove the older binding file. I have my openHAB server on a Windows based machine but I assume this procedure will work similarly in Unix/Linux.
In online guide that I followed to install OpenHAB there was one command
sudo chown -hR openhab:openhab /usr/share/openhab
that I didn’t fully understood is this what needs to be done after every addon?
This command is basically changing the ownership of the openHAB folder and all it’s subfolders/files to the openHAB user account and group. You shouldn’t have to run it again to make these changes.
Can you explain shortly this binding update.
This action adds the ability to send DSC commands to your alarm system using scripts and rules. Here is the wiki for the action that might help explain it in a little more detail.