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2. Open the .jar and install the client
3. Click on your start button and type %appdata% and go into .minecraft then your mods folder (or create one)
4. Drag you mods jar files into the mods folder
5. Start the minecraft launcher and select forge on the profile selection
That's it, it should be working if not i'll try to help.
Optifine: https://optifine.net/downloads
Not sure where XRay mods are