You often don’t need to download software from the internet
Manjaro provides an easy-to-use tool that will do all work for you.
More information about this in our wiki
Search and install software
• Search for “octopi” or “pamac” in your application menu and open it
• Browse through the list or search using the search bar
• Right-click on the entry and select “install”
• Click on the “apply” button or one with a tick mark
More information about this in our wiki pages about Octopi and Pamac