This is the first release, I don't know if I'm gonna say anything more to it other than:
"Before installing Pastieu, running the Pastieu version will require a lot of performance, since it uses shaders. You can disable them before importing them in MultiMC, P*lyMC, Prism Launcher or any sort of MultiMC-like launcher. By installing LFClient Pastieu, you acknowledge that kevadesu, LoewenfeldProjekt, IrisShaders, Mojang or Microsoft are not responsible for any damages that are caused to your device using LFClient. Proceed at your own risk."