1. In the Windows search bar, type “%appdata%” and hit enter. In the folder that opens, go to the folder called .minecraft.
2. Get a CLEAN Minecraft 1.5.2 setup. If you are not on Minecraft 1.5.2, you download it here. Just drop that file in .minecraft/bin.
3.
Extract "aether_1.5.2_1.0.zip"
4. In the Windows search bar, type “%appdata%” and hit enter. In the folder that opens, go to the folder called .minecraft.
5. Drop the extracted "
aether_1.5.2_1.0.jar" into the "mods" folder in .minecraft.
6. Drop the extracted
"playercoreapi_1.5.2_1.0.jar" into the "coremods" folder in .minecraft.
7. You’re done! Enjoy.