when i install red mod it dont show me red mod when i go in DLC please help me

This is normal for the awful galaxy store interface.

You gotta go to the squiggly lines button

-o--
--o-

And click Manage Installation
And then you CONFIGURE
And then you click DLC
And there it is shown with a checkbox (or not) depending on whether you "own" it

If it's not shown there you have to "own" it first by going here
https://www.gog.com/game/cyberpunk_2077_redmod
and adding it to your account

Yes, it is that obtuse.

Once it is shown there in DLC tab and has checkbox marked it will automatically be installed.