Ian Greive got reminded how to solve Integration Manager Error – You Must Close All Microsoft Dynamics GP Windows
Just to beat a dead horse, this was covered previously by a number of people an can be found on MyGPSearch.com
Integration Manager Error – You Must Close All Microsoft Dynamics GP Windows | azurecurve
Development & IntegrationGeneral Ledger & FinancialsInstall, Upgrade & Admin
Archived post from 2011. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.