u/DryDistance6858

So I bought the collectors edition a while back on ps5, played MG, MGSS, MGS, MGS2, and MGS3. It took me a while but I have now bought a ps3 and am wanting to continue the series with MGS4 guns of the patriots but, for some reason I am unable to download it from the PlayStation store. Am I missing something? Or, is it only available as a physical copy on disc.

Side note: I also own a pc so getting the game on steam is also an option but I haven’t been able to find it there.