I feel very foolish to report this, but the hardest problem to solve is when there isn't one. I expected the installer to show it was installing X-Plane 10.10 not 10.10r3 which in fact is version 10.10 release 3 not release candidate 3 (rc3). My confusion was partly due to the fact after updating to 10.10r3, my Flight Factor 767-300ER while it would load would not run because it interprets release 10.10r3 as a beta release. The Flight Factor 767-300ER will only load and not run with a X-plane 11 beta release as it clearly states in an error message. Thanks again for your help, it is very much appreciated and sorry for the wild goose chase.