Upgrading NIS1 (i.e., current public chain) to NIS2 (Catapult version)

Sink account seems to be criticized a lot, because of user action.
It could be hard but it has worked for PundiX token split PXS to NPXS. Every
user had to send PXS to sink account, some months after ICO.
Ofcourse NEM history is longer, anyway users shoud be aware that
NIS1 current version is 0.6.95 beta, and claims should go accordingly.
I also am very pleased this topic has been given to a community discussion,
where good ideas could come even after the open source release.
Technical people can contribute more here and investors sitting on a chair
should not despair.

Can someone tell me where are the instructions on how to make a snapshot?