Mohammad Daoud run into a problem and a fix with Dynamics GP 2010 R2 Business Intelligence Installation Error maxRequestLength
Mohammad R. Daoud: Dynamics GP 2010 R2 Business Intelligence Installation Error maxRequestLength
Install, Upgrade & AdminGP 2010
Archived post from 2011. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.