It's a problem with the texture.cfg, and not missing .DDS files. See attached image.

Copy the texture.cfg from the CS_B777F-II_GE110B1\texture.CS.2019 folder, and paste it in the texture.x folder for FedEx, making sure to overwrite the texture.cfg that was placed there by the ACE.

Content of the texture.cfg placed by ACE:

[fltsim]

fallback.1=..\texture
fallback.2=..\..\CS_B777F\texture
fallback.3=..\..\CS_B777-200ER_GE\texture
fallback.4=..\..\CS_B777-200ER_GE\texture\night
fallback.5=..\..\CS_B777-200ER_GE\texture\spec
fallback.6=..\..\CS_B777-200ER_GE\texture\bump 

Content of the texture.cfg placed from the texture.CS.2019 folder:

[fltsim]
fallback.1=..\..\CS_B777F-II_GE110B1\texture		//general F dif/spec/bump/lm
fallback.2=..\..\CS_B777-200LR-II_GE110B1\texture	//LR wings, 110 engines dif/spec/bump
fallback.3=..\..\CS_B777-200ER-II_GE90B\texture.CS.2019	//CS general
fallback.4=..\..\CS_B777-200ER-II_GE90B\texture 	//general, general 200ER
fallback.5=..\..\CS_B777-200ER-II_GE90B\texture\night	//general night
fallback.6=..\..\CS_B777-200ER-II_GE90B\texture\spec	//general spec
fallback.7=..\..\CS_B777-200ER-II_GE90B\texture\bump	//general bump
fallback.8=..\..\..\..\Scenery\Global\texture 

As you can see, the the texture.cfg from the ACE, is pointing to the CS 777F 32bit  version for FSX/SE/P3Dv3.

A bug with the ACE for the 777II Freighter?

Markoz wrote on May 18^th, 2019 at 12:16am:

Yes, it's fixed in the base pack 0.4 (coming soon)

Markoz wrote on May 24^th, 2019 at 3:11am:

Thanks, we'll check.
Meanwhile, the Fedex (same as any other livery) can be added to any variant: https://www.captainsim.org/forum/csf.pl?num=1548521028

Thank you.