http://blogs.technet.com/gediminb/archive/2008/02/04/microsoft-dynamics-nav-4-0-latest-available-version-build.aspxCurrent existing NAV 4.0 SP3 builds: 9/7/2007. KB 940718; NAV 4.0 SP3 rollback update 6. Client installer requires NAV 4.0 SP3 appropriate language installed. Client build 25143. Update must be delivered within 2 files (FixID's): Client installer anden-USCommunityServer 2.1 SP1 (Build: 61025.2)