You will have to get it on your own or you can apply for a student license here.
Right now you can only work fully with Maya 2015 and Maya 2018.
NEW: There is also a tutorial on how to get Maya 2018 30-day trial:
Simply select Maya 2018 instead of Maya 2020 at ~02:28
Select the one that matches your Maya version.
- LeagueMayaPlugin2019 (Does not work fully to create custom skins !)
Installation tutorial: https://youtu.be/oaGIkKzRNkU
IMPORTANT NOTE: The .env file is not fully correct in this video! If you do it like this you cannot load weighted models! It is missing the \others in the path for scripts.
This is how it has to look (depends on your placement ofc, just the paths in red have to be the same):
MAYA_PLUG_IN_PATH = D:\Dokumente\Maya plugins\Maya 2018\bin\plug-ins
MAYA_SCRIPT_PATH = D:\Dokumente\Maya plugins\Maya 2018\scripts\others
XBMLANGPATH = D:\Dokumente\Maya plugins\Maya 2018\icons
Starting with patch 11.3 Riot stopped using the old .skl format that RiotFileTranslator for Maya exports, so now you will update them every time you make your own remodel or you want to use an old remodel custom skin.
Maya script that detects vertices that have more than 4 influences assigned to them
Download: Maya VertSelect.MEL Script
Align your UV shells from multiple models easily
Download: UV – Helper By Marcius922
Other useful 3d-Tools
3D-Viewer that can play animations – Demo is enough unless you want to extract the models!
Make sure to grab the League of Legends SCO/SCB Plug-In from the third party Plug-Ins, otherwise it won’t load .skn files
.skn Viewer that can also load animations and export posed models, more complicated to use
Original Riot skin viewer, browser, can play all animations
Original Riot skin viewer, phone-app
Turnarounds of League of Legends skins