Hey cya081! We understand the concern and we'd love to get to the bottom of this! Please make sure that you have enough storage for downloading the game, downloads require double the amount of storage on the device to download. If the storage on your device isn't the issue, the please attempt the following steps:
Performing a factory reset will not remove your purchases from your account, however you will have to re-download all your downloaded games. A factory reset has been know to fix issues with install failures, and is highly recommended!
We hope these steps help! Please let us know if these steps prove useful in getting your games to download!