Click the .zip link right in WebView: the file goes to the downloads folder (the folder button next to the address bar). From any other computer, save it and copy it to the disk or stick you boot ColibriOS from.

Open the .zip in Eolite: Unz starts and asks where to unpack. Choose a real disk (/hd0/1/, /usbhd0/1/, /sd0/1/), not the RAM disk: big games do not fit in /tmp0.

Open the unpacked folder in Eolite and run the program from there: games read their data from the current folder. Each program page lists what to run.

Open an issue at git.colibrios.org and say which archive, which machine and what the debug board (/sys/develop/board) shows.