Help!!!
Downloaded Pt 13 and Pt 14, followed install instructions to the letter, but nothing seems to have taken. None of the new aircraft have appeared.
Back tracked 3 times and tried again but no change 
Don't panic! CUP is the safest way to mod and is NEVER broken, either here or at your place. Let me explain. There are always 2 components to CUP:
1) The SFS Content.
2) The mod folder to config it
The new SFS content remains dormant and doesn't effect the sim in any way until the mod folder configures it or refers to it.
All problems or crashes have common causes:
1) Incomplete or missing SFS files (Logfile will point the way).
2) A conflict because of something you put in there (Logfile will point the way).
3) Incomplete or missing data in the mod folder (Logfile will point the way).
So you can easily step back to your mod folder from #WAW Part-12 - Try a test with that one in place instead and confirm that everything is OK.
Next: Get logged. Launch and crash? - Then read the logfile. Without it you are guessing and nobody has a clue. I bet something is missing or in the wrong place but only the Logfile.TXT will tell you, and us, for sure.
Look to the last part of Logfile after a CTD/lockup or crash and the last few lines will indicate the error. Look for the word error. With a bit of practice logfile will lift away the veil of mystery.
I install and test hundreds of mods over a month, many of which don't work or effect something else I didn't know about. At Hangar-19 we smash the sim over and over again, often we get surprised by something we didn't expect. Without Logfile we can't do anything.
Back up what you are doing. CUP always enables you to return to the previous step. Read your logfile and give up guessing. With a bit of practice you will be in control of events and not be phased by the un-predictable.