You need to access the store application again to re-install the old version of SuperVault. It's possible the encrypted folder/files are not recognized by the new update. Many developers update applications, but instead they also change the name of the software. The SuperVault app uses device+password and keystrings generated from IMEI to unlock the vault. By all means, do not uninstall the application completely, or you will lose access to encrypted folder/files/vault forever.