What about old Files.?

Hi All..

Some month ago i download this small 2.5GB Game.
Angry_Birds_Star_Wars_EUR_PS4-SharpHD
If i extract, i have an .ISO File..
I think i can Delete it, right.?
because on 4.05 or 4.55 these game and other old isos don´t work, right.?

Thhxx