1.19 support
The plugin supports 1.19.x partially without me updating it.
You just have to use alternative ways to use 1.19 features. For example, use raw-id instead of id; raw-material instead of material; raw-sound instead of sound.
If there is any issue, instead of posting a bad review (Some users did & I didn't care), join the discord server & tell me directly.

The current status
I've been doing some major changes for the next big release of BetterGUI (7.0).
The biggest change is to remove XSeries completely & move it to an optional addon. That way the plugin will be future-proof, so that we'd not have to wait for the plugin "adding support for X version". That also means I'll remove the Supported Version section.
Also, there will be major changes to make the plugin lighter & easier to use, including a revamped community-driven wiki.
It'll take a very long time for all changes to be completed because of how big they are & the fact that this is a free plugin and I only do it in my free time.
Again, Do me a favor & wait peacefully for the new update.