Issues with getting the full/ paid version of the app but I love this otherwise...

Im not sure if it is my ipad or if its the app but it wont let me download the full version. It will only tell me that it cant get to the app store... is there not a way to just directly/ initially download the whole version? :( Love this game and was convinced to get the paid version but it wont let me. This doesnt happen for any other app I have on this device.. Help! :/

Reallylongopinion about Micro Battles