yeah, as far as i know, this is a pretty normal thing. i think it's asking in a roundabout way for storage permissions (this is what some barebones research tells me as i don't have an android myself). i absolutely would understand being uncomfortable with this kind of permission request, but from what i can tell it's very normal and common. i can tell you that i trust blackeye (my android porter) and this specific update has been downloaded a few thousand times without complaint, but i'm sorry i don't have more info about why it asks that!