Unfortunately, due to the large number of changes in SQLCipher 4, you cannot make runtime adjustments to allow a SQLCipher 3 library to open a default SQLCipher 4 database file format. We would either recommend updating the server side to 4.x, or if that is not an option, setting the compatibility mode of the SQLCipher 4 client library to use version 3, you can find more information about that here.