Solution : https://service.sap.com/sap/support/notes/1541648 (SAP Service marketplace login required)
Summary : 
      As a system administrator, if you have configured server files like SapLogonTree.xml, saplogon.ini, and sapshortcut.ini for SAP GUI 720 user distribution via HTTP server, yet face issues with SAP Logon not displaying entries, a resolution involves SAP Logon enhancements introduced in newer SAP GUI for Windows patches. Check and install the required patch (details in SAP notes and the Service Marketplace), ensuring patches are cumulative. For patch delivery details or status updates, refer to specific SAP notes or the SAP Developer Network.
Key words : 
threadid=449137&tstart=0 downloading sap gui patches, /irj/sdn/sap-gui, sap logon doesn' show, sap gui installation guide, terms sap gui, sap gui patches, sap developer network, sap service marketplace, supported solution implementation, expected delivery dates
Related Notes : 
       
| 1550305 | Logon Control: Server configuration file via HTTP | 
| 1426178 | SAP Logon (Pad): create/distribute server configuration file | 
| 1053737 | Expected release dates for SAP GUI for Windows & ITS Patches | 
| 563161 | SAP GUI, SAP ITS & SAP IGS patches on Service Marketplace | 
| 535308 | How to apply a SAP Front End patch? | 
| 330793 | Downloading patches |