I seem to have downloaded IOS 8.4.1 somehow without noticing. I have however not installed it yet and do not want to do so. It is just sitting there taking up a lot of space and recently my language learning apps are crashing all the time. Can I safely delete IOS 8.4.1 without any problems and do you think my learning apps might then show improved performance? I am currently running Version 7.1.2 and it always worked just fine for me up until recently.