Different version of TeamViewer

Hello,

I cant connect to my computer from my old ipad, it says something like this: "Your partner has newer version of TeamViewer" and "update" button below. The problem is my old ipad (its an ipad 2 running ios 8) . When i clicked update, the appstore appear, but i cant see "update" button but "open"... so what should i do? *of course except for bought a newer ipad :smileylol:

Thx