Hello mahimahi42 and  welcome on this Forum
Do you want install a software from the page All Softwares or from your personnal software's collection?
From All Softwares: All is writted on the top
Click on this icon 

 to install or update the software > Launch your LiberKey and Files associations (menu LiberKey Tools -> Enable files associations) and finaly just click on Install now on my LiberKey or Download setup package.
From your personnal collection: Add the software's folder in MyApps folder. Open Liberkey 4.4 menu and drag-n-drop the executable in "My softwares" category. 
Right click > Properties > Edit path with 
..\..\MyApps\Your_software\Your_softaware.exe