Which of the Files and folders to upload

Am new here and I installed my elgg website through my cpanel and now I can see a higher of version 5.1 and my is 4.3.

Please am here to ask you friends on how to do the upgrade through my cpanel; I want to know which of the elgg version 5.1 files and folders will I upload to my cpanel using my ftp.

Please help me out am a novice