Every new MediaWiki release, I will pull the latest code for your skin. If your skin fatals I will disable it and file an issue against your skin. I will also update the entry on MediaWiki.org to mark it as unstable.
First make sure your skin is no longer fataling and the fixes are merged into master/main branch. Please also address any deprecation warnings before requesting an update.
Then please Create a new issue to get the skin restored on the demo service.