What is installment agreement and does Sprintax provides such option?

You can make monthly payments through an instalment agreement if you're not financially able to pay your tax debt immediately. You will be required to pay a fee for setting up the Instalment agreement. However, you will reduce or eliminate the amount of penalties and interest you pay and avoid the fee associated with setting up an instalment agreement if you pay your tax bill in full. 

You can check more about the installment agreement here - https://www.irs.gov/forms-pubs/about-form-9465

Please be advised that Sprintax does not support Instalment agreement application though.