Hi there,
Thanks for reaching out. I’d be happy to help with your question.
We do have automatic update support for staging sites with some top level domains, but unfortunately not yet for subdomains. There are three options for your circumstance.
1) Switch the domain that is connected to your license when you start to do testing on your staging site, and switch back when you’re done.
2) Download the updated plugins from your Account Downloads Page and manually update them on your staging site.
3) Purchase an additional license, or upgrade to a license with more installs, to avoid either of the previous steps.
For more information about how our licensing works for development environments, check out this article: https://theeventscalendar.com/knowledgebase/using-one-license-live-dev-sites/
Hope that helps! Please let me know if you have any additional questions about this.
Thanks,
Sky