1) Your support available until 2020-01-04. If you need information how to update support in future read the docs https://xstore.helpscoutdocs.com/article/92-how-to-renew-support-period
2) The latest version of Xstore theme is 6.2.4, XStore Core plugin – 1.5.4, it was released 05.12.2019 https://xstore.8theme.com/update-history/
We release regular theme updates (every week as a rule) to fix minor issues and implement improvements.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.