Hello
After 50+ hours of playing, any meteorite have crashed on my world
Are they a way to bypass the need of that?

Game version: 1.12.2
Mod pack: FTB Revelation
Morph version: 7.1.2

Wait, what?
http://www.9minecraft.net/morphing-mod/
Am I using the wrong mod?

Don't worry, I download all my mods from curse or gitub.
I just used this site for more explanation about morph, and it talk about a meteorite

Edit: Anyway, when I kill a mob, I see the animation but I don't get his appearance
What I'm doing wrong?

The answer you're looking for, I believe:
Use the [ or ] key to bring up the list of acquired morphs, and to cycle through them. Once you find the one you want, press "Enter". This will morph you into the mob.
To make things quicker, you can press the "~" key instead of "Enter" once you've cycled to a mob to "Favorite" it. Then, later, you can hold down "~" to bring up the Favorites wheel and choose your morph with your mouse.

Edit: Markdown broke my comment
Edit2: I had to learn Markdown in order to post this comment correctly lol