The GitHub pages deployment of appcast.xml is referenced incorrectly by the app and causes an error when checking for updates in-app.
The app attempts to check the URL https://sbarex.github.io/SourceCodeSyntaxHighlight/appcast.xml (returns 404), when it should actually be checking https://sbarex.github.io/QLSyntaxHighlight/appcast.xml
From what I can see there are two places where the URL is misconfigured. Hopefully should be an easy fix...

The GitHub pages deployment of
appcast.xmlis referenced incorrectly by the app and causes an error when checking for updates in-app.The app attempts to check the URL https://sbarex.github.io/SourceCodeSyntaxHighlight/appcast.xml (returns 404), when it should actually be checking https://sbarex.github.io/QLSyntaxHighlight/appcast.xml
From what I can see there are two places where the URL is misconfigured. Hopefully should be an easy fix...
Casks/syntax-highlight.rbApplication/Info.plist