Thank you for your message.
I’m looking forward to hearing back from you.
Okay, I've tested it and reviewed the code and there's nothing stopping you from using it with v4 versions above 4.0.2. You will see the following warning, but it won't stop the plugin or the engine from compiling and it works as expected:
Plugin "crawler" was created for an older version of GB Studio and may not work correctly. Plugin uses engine "4.0.2-e0" but GB Studio is using engine ...
Once the new version finally comes out, I'll probably have to do some refactoring, but for now it's compatible :D