The doc files and/or README file will inform you should this be the case.
There's nothing wrong with this sentence. It could have been written as:
"Should this be the case, the doc files and/or README file will inform you."
"If this should be the case, .... "
"If this is the case, ...."
"If this should happen to be the case ...."
You'd have to refer to the previous sentence to work out what "this" referred to. Perhaps the previous sentence says "Sometimes the installation does not work properly". "This" then refers to "the installation not working properly", and the original sentence makes sense.