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You want

\usepackage[style=chicago,notes,backend=biber]{biblatex}

as styles are loaded not as separate packages but as configurations for biblatex itself.
Thanks for the quick response, but this doesn't solve the issue. The biblatex-chicago documentation allows loading the package directly ...

Hi,
I've currently updated from MikTeX 2.8 to 2.9 and am now having problems with installing/loading packages. I want to use biblatex-chicago and have installed it with the package manager. Using XeLaTeX (I've tried normal LaTeX, too), I only get a


! LaTeX Error: File `biblatex-chicago.sty' not ...