Well, the new dynamics file uses your "original" 747 panel. It means if you did not have any yet in the EHM-747's panel folder, then you will not see it. If you used a personal panel, that is stored at a different aircraft folder, or it has other name than PANEL, this new cfg file will not find it.
You can alias any panel to this file. Just open it, and look for the "panel= " fields. You will find 7 of this, as this cfg contains 7 different 747 paintings. If you enter here the panel location, the aircraft will load it. For example you can use the iFly panel: "panel=iFly 747-400\panel" if you have it, or even the PMDG one: "panel=PMDG747-400\panel" directly from the EHM 747 folder.