1) unzip toma345.zip folder to a suitable folder, your desktop for example.
2) copy the sound and sound.ai folders from your default FSX Airbus_A321 into the new Tom_A340-500 folder.
3) copy the following files from your default FSX Airbus_A321/panel folder into the new Tom_A340-500/panel.340 folder:
airbus_a321_panel_background.bmp
airbus_a321_panel_background_night.bmp
Airbus_A321.cab
do not copy other files from this folder!
4) copy the following files from your default FSX Airbus_A321/texture folder into the new Tom_A340-500/texture.AA folder:
Airbus_A321_1_C.dds
Airbus_A321_2_C.dds
Airbus_A321_3_C.dds
Airbus_A321_4_C.dds
do not copy other files from this folder!
5) create a new folder into your FSX/gauges folder and rename it "tom340".
6) unfold the Airbus_A321.cab into the new FSX/gauges/tom folder.
7) copy all files from the Tom_A340-500/gauges/tom340 folder into the FSX/gauges/tom340 and confirm overwriting all files.
8) move the entire Tom_A340-500 folder into your FSX aircraft folder.
9) Unzip all files from the lighteffects folder into your FSX/effects folder

THERES A STEP BY STEP INSTALATION MANUAL WITH PICTURES IN PDF FORMAT IN THE MANUAL SUBFOLDER. LOOK FOR MFP.PDF