This is the CRJ-550 cabin layout for PACX.

10 seats 1st class
20 seats economy plus class
20 seats economy class

Installation:
Extract the archive into the following directory:
C: \ ... YourUsername .. \ Documents \ PACX \ Airplanes \
or
C: \ Program Files (x86) \ TFDi Design \ PACX \ Assets \ Airplanes \