All flipbook textures provided are 2048x2048.
These are not finished drag&drop vfx, these are resources to help vfx artists make things look better, and simplify their work. Don't buy this if you want a VFX library to use in your game.
The shaders provided work in URP, buy you can easily edit them to make them work on the Built-in renderer or HDRP.
All the shaders are made using Shader Graph, and are very simple, so you can customize them for your specific needs.
Prefab examples are provided on how to set up Shuriken for these shaders to work, and a PDF readme with step by step instructions.