I do not think that it's compatible with the Spark. That one is flown with the DJI GO4 App. The official page with all DJI Apps is here.
As for the changes present in this version the site does list only these:
What’s New (27.11.2019)
- Adds support for Russian and Italian languages.
- Allows users to switch between Map views.
- Fixes an issue where files were damaged when using templates.
- Fixes an issue where QuickShots failed to generate.
- Fixes an issue where DJI Fly crashed when used on certain Android phones models, including Samsung Galaxy S7 and Galaxy S6