Gig performer in cubase 12

Hello all.
I am having difficulty recording the output of GP4 in cubase 12.

I don’t have interface

Can someone please help me with this in step by step? Or even better with a video tutorial.

You need a virtual audio cable or you record the audio from GP and import the recorded files into Cubase.
Maybe that helps

Have you seen the blog post, and related topics listed at the bottom?

Yu can also record outputs in Gig Performer using its built-in recording feature.