Hi everyone! I'm new here and I have a bit of a noob problem, I guess.... So I was putting some mods that I discovered with this video ( ). The mods are listed in the description and in the description there is modpack called "Modpack" with this link ( https://ownagenetwork.zendesk.com/hc/en-us/articles/201567544 ) below it. This mods only work in the 1.5.2 version, anyways I installed only this Modpack with the tutorial and then I went back to youtube the checkout the shaders pack and Optifine. I would love to have them but I don't know how to install them in the default launcher. I can't use Magic Launcher because the persons that made the Modpack said that some of the mods that are in the Modpack don't work with the Magic Launcher. How can I install Optifine 1.5.2 HD Ultra D3 and Shaders?