Epik Child Theme Update

In checking my Epik theme, purchased through StudioPress, I just discovered that I am on version 1.4. Would like to stop using my page builder and use the block editor but it looks like I need a newer version of Epik to do this.

1) What are the best practices for the update to the most recent version
2) Are there changes in the theme set-up I need to know before making the upgrade
3) My StudioPress Dashboard only has an update to version 1.6 from 2016

Any suggestions, advice you can provide would be greatly appreciated.