Yes. Simply place the texture folder in the main aircraft's folder, then open up the aircraft config file. Find a section that looks like this
[fltsim.xx]
title=xx
sim=xx
model=xx
panel=xx
sound=xx
texture=xx
kb_checklists=xx
kb_reference=xx
atc_id=xx
atc_airline=xx
atc_flight_number=xx
ui_manufacturer=xx
ui_type=xx
ui_variation=xx
ui_typerole=xx
ui_createdby=xx
description=xx
and replace the for texture= put in whatever is after the . in the texture folder name (texture.xx). adjust the other sections as fitting.

??

I just installed a USAirways livery this morning using ACE with no problem. What livery are you trying to install?