Yes, If you are an undergraduate student, you can pay in two instalments. If you choose instalments, you will need to pay at least 50% during registration (after discounts and deposits) and the other 50% as follows:
The last Friday in January (for September starts) / The last Friday in May (for January starts) / About 5 months after registration (any other start date).
If you are a UK / EU Postgraduate student a different instalment schedule is available. Please visit: https://www.gre.ac.uk/finance/fees/how-to-pay-your-fees for details.