Red Exclamation markers are caused for "meshes Missing textures"
The games, all of them come with 1 red marker file to tell the player in game the assets are broken , that's the purpose for the red marker file.
Lets the developer know there's a problem with textures.
so, it is really important archive invalidated is in effect or you extract the files to the data folder from the bsa archives.
there are tools we use to do that. However it is in this way we diagnose games, it's Not a recommendation to do that all the time.
as far as i am concerned the package I just downloaded is broken.
I took the program apparat to inspect it's guts.