Grocery CRUD is released with MIT license.
You can download straight away the latest stable version from here:
Compatible with Codeigniter version 4.x
Also check: github codebase
In case you are intrested to download Grocery CRUD Enterprise you will need to buy Grocery CRUD Enterprise and it will have a separate website for the download area.
If you are looking for Codeigniter 3 download page checkout the URL: Grocery CRUD with Codeigniter 3