CoroUtil is not any strange thing, it is just a library of classes that all Coros mods use. If you want to install any of Coros mods, you need to install this.
How to install:
- Download and install Minecraft Forge.
- Download the mod.
- Go to %appdata%.
- Go to .minecraft/mods folder.
- If the “mods” folder does not exist you can create one.
- Drag and drop the downloaded jar (zip) file into it.
- Enjoy the mod.
Download Links:
For 1.7.10
http://dl.mod-minecraft.net/download.php?file=31841c5bf668621c7ee079aa4981ef9c