chmod +x filename.run ./filename.run#Assume the file is called some-app.run and is in the folder /home/user/Downloads. You will need to modify these instructions to fit your situation. #1: cd /home/user/Downloads #2: chmod +x some-app.run #3: ./some-app.run #if step 3 fails with a message including 'permission denied', try entering sudo ./some-app.run (you will need to enter your password for this).