The best way to go is to download the liveries for the specific aircraft.

If the livery is for the 737-200, then add it to the 737-200.
If the livery is for the 737-200ADV, then add it to the 737-200ADV.
If the livery is for the 737-100, then add it to the 737-100.

It is possible to use a livery for the 737-200 on the 737-200ADV, and use a livery for the 737-200ADV on the 737-200, but liveries for the 737-200, or the 737-200ADV will not work on the 737-100.