I just bought the Casio G'zOne and everytime I download an ap for it I get "Package file is invalid". I use Play Store to get the ap. I tried clearing the cache and data for Play Store, I turned the phone on and off, I took the battery out of the phone and turned it back on, I looked for System updates and downloaded any updates needed. I bought 2 of these phones. Both work perfect for everything except for downloading aps. Is there a software update I am missing or are these phones too old to get newer aps. Aps I have been trying to get are Words with friends, weatherchannel, Angry Birds, etc. It seems that if I keep trying, then one of the phones will finally successfully download the ap and work. But I watch my nieces with their Droid and Samsung Galaxy and they don't have any of these problems. Any help would be apreciated.