Why can't I download certain games?

[Windows Central Question]

I live in the UK and have a Nokia Lumia 520. For some reason I cannot download games such as Jetpack Joyride. My friend has the exact same phone but can download it. I would like to know why this is.

 

[mhc48]

At first I had the thought that it might be because it required 1GB memory to run which the 520 doesn't have, but I was just able to download and run in on my 635, so it's not that. Do you have enough memory on your phone to download it?