Jambo msfs

Hey I am downloading addon msfs (free aircfat) and install them in the community folder as described on YouTube . but Some planes work and some don't. I noticed that there are zip files of different sizes from 20mb to 300mb and more with a different folder structure. 1. How to make all planes work. 2. Can I combine (for example, adapt the cockpit of another aircraft to an aircraft that does not have a cockpit) I apologize for the quality of my English. Thanks