I would like to run PHP 8 but it is not supported by a debugger. The latest debugger is v7.4. When will we get an updated debugger?

The latest version supported by debugger is indeed 7.4. We're working on the next version to provide support for PHP8, and debugger is not the only component that requires changes. There are many changes in php syntax -- in its parser, in php extensions and we have to update Code Insight -- code completion, find declaration, refactoring etc, Syntax highlighter, built-in standard function definitions etc and it requires more time. We're doing out best to release new version asap.