If you want to learn, it's pretty simple.
1st, you need Win-RAR or 7-Zip. Next, you rename it to bootanimation.zip, open the flashable zip, and replace it with the bootanimation you want flashable.
In other words, thanks. [emoji14] I didn't know there was a fixed version. I really love this compared to the lower quality one. I'll make a flashable if you can't do it, unless someone beats me to it. [emoji14]
EDIT: Flashable zip added for the gap-less version at the start of the bootanimation, credits to
@The-Droidster @guerreromanuel
This appears to be the Bigger version that looks better on tablets. Going to attempt it myself to fix the smaller version.
I managed to edit the smaller version as well. Created 2 flashable zips for both with no gap at the start. I now know how to edit the desc.txt file in bootanimations now too.
IMHO, the smaller version looks better, and it's the same size as the one that comes with our Nexus 5.