Before you install Management Reporter, make sure that ALL of your GP companies have a functional currency assigned. All means, all the companies attached to the Dynamics database that you are using. If you have a test company missing a functional currency, the install will fail. Make sure that you check them all.
Weekly Dynamic: Management Reporter Install and Functional Currency
Tips & Hidden FeaturesInstall, Upgrade & AdminReporting & BI
Archived post from 2014. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.