If the web.config change ppascualv suggested doesn't work, try putting it in the IIS Express applicationhost.config, which can be found at
%userprofile%my documentsiisexpressconfigapplicationhost.config
under
<system.webServer>
put
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="524288000"/>
</requestFiltering>
</security>
This should set it as a global, unless a web.config from an application overrides it.
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