The content of this blog post has been deleted and I am referring to the readme document on GitHub.
Originally it contained steps that were needed in SAP S/4HANA 2020 systems.
I have however removed support for this platform since the downport to this version was to cumbersome for me.
How to use the RAP Generator (how to on github)
The basic difference on premise is the installation part, since on premise you have to use the report ZABAPGIT to upload the source to your SAP S/4HANA system.