1) Restart your PC
2) Delete your 1.8.8 install in %appdata%
3) Launch the vanilla launcher and play Minecraft 1.8.8
4) Once you see the title screen quit.
5) Extract a new MCP to a folder. Make sure there are no spaces in the folder directory
6) Do https://discordapp.com/channels/594335572173258752/637484447205425153/652053663828672532
7) Do https://discordapp.com/channels/594335572173258752/637484447205425153/648306714474709002
8) run decompile.bat and cross your fingers