Hi!
------------------------------Vanilla Version------------------------
Install as always...unzip and insert the mod files on your mod folder
Use ScriptMerger to resolve any possibly conflict.
Enjoy!

------------------------------PTWS Version---------------------------
Install first PTWS mod (https://www.nexusmods.com/witcher3/mods/1841)
on your mod folder in the game directory and unzip the E3 Kaer Morhen 
Leveling Starting Armor and Swords mod on the mod folder.
Use ScriptMerger to resolve any possibly conflict.
Enjoy!