Good question, as mine did not update when everyone else was getting the trouble with the 2 version. I actually went into MS Store App and disabled automatic updates to prevent me getting the faulty version. I am staying on 1.9 till I have finished all my
existing Jigsaw collections.
However I did notice - on the top right is a down arrow with a number by it showing the updates available. Also if you click on the three dots next to it, it lists your Apps and whether updates are available. Interestingly Jigsaw is not listed in mine presumably
why I managed to avoid the recent shambles. If yours shows you should be able to click update to get the latest version.
Strangely if I click on installed Apps on the right hand side Jigsaw is there but no means of updating. I suspect I will have to uninstall (from Add remove programs) when I want to upgrade and then re download it.
Hope this helps you