I can't see other systems than raspbian on noobs installation window. RPI is connected through internet by WiFi - no possible connection through rj45. Is it possible to obtain network installers (other systems) using WiFi?
Unfortunately, it is NOT possible to connect to download another Operating System using Wi-Fi. You'll have to use an Ethernet Cable.
If you cannot see all the Operating Systems you would expect, go to the Raspberry Pi website and then download the NOOBS package there, as it would be the newest version.
Having said that, using an Ethernet Cable to download an OS is probably a reasonable idea. Ethernet connection are considerably quicker than using a wireless connection.