Gst cancelation and regarding stamp paper

Hi everyone, One of client has closed partnership business on 31.3.2020. Due to lock down he has not taken stamp paper for dissolution deed.

1. What should be done? Can he take stamp paper now?

2. And the second partner is continuing the business which has to be draft in dissolution deed right? Now he want to apply for fresh gst registration. Can he do so in the same office before cancellation of gst registration?

Awaiting for your reply,
ASHEEQ ABUBAKER