After some big problems with Wilco-products-installations after ZürichX
under Vista Business 64 bit, my PMDG747X failed also.
I was not able to find any addons in my menue.
I had the same DLL-error as described from all other users.
I tried also to reinstall the addon manager seperately, but no success.
Then, I tried to install the unregistered FSUIPC-version to have my first
new addon in my menue line, and I don´t know if I had only luck,
ZurichX and PMDGX worked again without any problems after the new
installation.
This is only a little help for all the others, but I don´t know if this is
the real solution !!??
Kind regards.....Markus