Can the proper officer allow payment of tax dues in installments

Yes. On receipt of application filed by a taxable person in Form GST DRC-20, the Commissioner, after recording reasons in writing, shall issue an order in Form GST DRC-21 extending the time for payment or allowing payment of any amount due under the Act in monthly installments not exceeding 24, subject to payment of interest under section 50 with such restrictions and conditions as may be prescribed.

(ICAI FAQ PUBLICATIONS 06-09-2017 Payment of tax and other amount in installments: FAQ NO. 49)