Patch-4
Patch-A
Patch-B
Patch-F
Patch-G
Patch-K
Patch-L
Patch-T

Those are custom patches. I don't know what's inside of them.
You should always extract the files from the latest patch. Open patch-T. If there is no blood elf model, close it and open patch-L. If there is no blood elf model, close it and open patch-K, etc.

Also, I edited every single MPQ that has that.
Didn't work.
Any ideas?

Once you modify your model, put it inside a new mpq. If your latest patch is Patch-T.mpq, name your new mpq "Patch-U.mpq".
I just edited the model and it works. If it doesn't work for you, then you are doing something wrong.

Wow that's good.
Only issue I'm having is I thought that BloodElfFemale.M2 is the  blood elf model I need to load?

What am I confused about here?

That's for the blood elf male.

For the female the process is quite different since the jump sequence order is different.
-Go to animations.
-Look for the "Jump Start" animation (in the 3.3.5a model it's ID 108).
-Go to NextAnimation and replace "109" with "-1".



For the WoD/Legion model it's the same (the animation is id 113. Replace NextAnimation "114" with "-1").

This script for 010 editor converts Wrath of the Lich King .M2 and .SKIN files to Cataclysm, Mists of Pandaria and Warlords of Draenor.

Supports:
-Cameras.
-Particles.
-Animation flags.
-Projected shadows.
-Transparency flags.
-Blend mode overrides.

Also includes:
-Batch file converter.
-Shadow remover script.
-Sequence flag remover script.
-Skin template for 010editor with shadow batches added.


Some notes and technical information:

-make sure you are working on "OVR" mode before running the script.

Projected shadows
As you may know, projected shadows are stored inside the .skin file since Cataclysm. This script creates shadows for all texture units, including those with additive materials.
If you want to remove the shadows from a specific geoset, just open the skin file with 010editor, run the skin template included inside the tools folder and delete the texture batch corresponing to that mesh.
If you want to remove ALL shadows from a model, just use the "Cataclysm Shadow Remover" included in the tools folder (it's useful for stuff like fire or lights, that are not supposed to cast a shadow).


As you can see, the glow, which is a billboarded square with addivite renderflag, is casting a shadow and the game can't handle shadows with additive materials. To remove it I selected its shadow batch, deleted it and reduced the shadow batch count by 1 in 010editor.
More info in this video:


Flying mount animations
In WotLK, mounts use swimming animations for flying. Since Cataclysm, however, there are separate ids for swimming and flying since flying mounts can now be used as ground mounts and therefore swim.
But, if a mount model doesn't have fly animations, the game will use its swimming animations. That's why this script doesn't duplicate them. It's not necessary. WotLK flying mounts should still work perfectly in Cata, MoP and WoD.

Reflections
This script doesn't convert reflections since there is no exact way to know when a texture unit is used for a reflection, glow, etc. So you must do it by hand.
Just open your skin file, convert it to Cata+, go to the texunit with the reflection and change its shader to "144". Here is an example using "Creature\Murloc\Murloc00.skin":



You can change the "texunit" and "texunit2" fields to "0" but it's optional since those fields are unused since Cataclysm, but just in case.

Animation sequence flags
Sequence flags are 128 digits bigger since Cataclysm. Without these flags some animation frames loop when they shouldn't and sequences don't blend correctly. This script fixes that problem and gives smoothness to the animations.
If you want to remove the extra flags for some reason, just run the "Cataclysm Sequence Flag Remover" script included in the tools folder.

It doesn't have a dropdown? How do I edit it?

then how you can put in a "Wotlk Style" the extra visuals from "Wod or Pandaria?"

Put the extra stuff inside a new texture and use it as a "skin extra" slot tied to the skin color. It's the same method taurens use for their fur and female pandaren use for their hair.
For example, you can put the undead bones in the extra texture since they don't fit anywhere in the character texture. Same goes for the Pandaren tail and sandals.
Since the "skin extra" texture doesn't have a size restriction and doesn't need to be indexed, you can add a lot of details.

Sample:


(Done with my Photoshop action pack)

I added 30 lines 0s at the end of the M2 by 010editor and it crashing still, 0xC0000005 (ACCESS_VIOLATION) at 0023:004C21B9

Check the new version.
It shouldn't crash anymore.

Also, added links for Cata, Mop and Wod.

Here's a picture of it happening with fear.

Is the texture square or rectangular? That bug happens a lot with custom rectangular textures.
If square, change them to rectangular.

Also, add a few 0s at the end of your file and add 1 digit to your texture length. For example, if your texture has 12 characters, change it to "13". If your texture is 24, change it to "25" and so on.