1.Unzip downloaded folders to a Temp directory on your system.
2.Copy Texture.LTU into
C:\Program Files\Microsoft Games\Microsoft Flight Simulator X\SimObjects\Airplanes\Airbus_A321
3.Add this entry into your Airbus_A321 Aircraft.cfg file
Paste it in sequence between the both lines. Rename "FLTSIM.***" to next number in sequence ie: fltsim.8 etc
_______________________________________________________________________________________________
[fltsim.***]
title=Airbus A321 LTU
sim=Airbus_A321
model=
panel=
sound=
texture=ltu
kb_checklists=AirbusA321_check
kb_reference=AirbusA321_ref
atc_id=D-AIRT
atc_airline=LTU
atc_flight_number=
atc_parking_types=GATE,RAMP
ui_manufacturer="Airbus"
ui_type="A321"
ui_variation="LTU"
ui_typerole="Commercial Airliner"
ui_createdby="Microsoft Corporation"
description="The Airbus A321 is a stretched version of Airbus best-selling short- and medium-range A320. The A321 has a slightly increased wing area, stronger landing gear with larger tires, and engines with increased thrust. When the A321 entered service in 1988, it pioneered the use of glass cockpit instrumentation, the first digital fly-by-wire control system used in an airliner, and sidestick controllers."