Leaving a 5 star rating since I know the issue is rather caused from actions on my part.
I have correctly installed the Formula Hybrid 2020 mod and all the cars work (with the default liveries that came with it). I also installed the custom shaders patch through CM, but for some reason after I had dragged and dropped the 2020 livery files into the "content" folder the liveries in game are all black. just the liveries - the tyre colors change depending on the compound, the drivers helmets are accurate, but for whatever reason the liveries are all black. In some cases (for example, RP livery) I can see the no.11 on Checos car, but thats about the only distinguishable feature that differs the black skins.
As I mentioned - I installed via the manual way (first deleting all the skins in the rss car folder) and then dropped all the content files, but still got the mentioned issues. Also tried installing via CM, but the installation never really begun, it just was in "Searching content..." mode for a long time and never installed anything that way.
Hopefully there is a simple solution to this, maybe I missed a step in the process!
Thanks a lot in advance for your help!