Open a terminal window or if your using a text only just logon to linux and enter the rest of the commands from there
Type in wget -O eclipse-app https://eclipsegpt.xyz/app/eclipse-linux.sh.txt and press enter
Set permission to execute file by typing in chmod +x eclipse-app
You have a choice to install it or just execute the file without installing. Type in sudo ./eclipse-app install to install or ./eclipse-app to not.
if you installed it you can enter in eclipse at the terminal. If you didn't you can use the other command as you used before. Just make sure you open it from the folder you orginally downloaded it too.