Based on real Citilink 737-5U3F MSN 28727 PK-GGC - Converted to freighter fron the company
To install simply open the .ZIP file, extract the .ptp file of the livery to a folder or desktop of your choice, open the PMDG Operations Centre, Aircraft and Liveries tab on the top, livery utilities and then "Install from PTP file".
Feedback and donations are always appreciated