PPSSPP not shown install button

[TkSilver]

The last IOS device I owned was an ipod touch 4th gen (however old that is now). My educated guess is that the ipad 2 is running an older version of IOS 9.3.5 and the SE is probably running a newer version 11.3 (is the latest). I would also assume Apple did something that borks running non Apple apps because they always do and that is why one works and one does not. As to the solution I have no clue and someone who uses Apple products more might be able to help if you ask nicely.