Uninstall your previous version 747-400 and 747-8 and after that clean your registry. I did option 1 using the control panel program and feature to unistall PMDG 747. then install the new ones. in FMC Aircraft option 16 activate the EFB. Happy Flying.
Thanks ! Much appreciated.
to the people saying the EFB does not work and FMC freezes, does that stuff happen to the 747-400 also with the new gauges ? I still havent updated the 747, so would like to know before updating.