GTA V has been released for free on the Epic store until May 21st.
Redux 1.8 has been tested with this version and it does work
As of writing script hook is not working (patch is incoming soon) however Redux will work without.
The current Epic Store version of GTA V is 1.0.1868.4 and it works with Redux 1.8.
So make sure you get your copy of GTA V now while it’s free and get downloading Redux