Install to your Skyrim Data Directory and replace any files.

This will REPLACE vanilla bow models.  Keep this in mind if you are already using a bow mod which changes the vanilla Skyrim bows models.
This will NOT replace any existing textures, all textures used by these bows are unique.

If you have manually installed and wish to uninstall or your mod manager has not correctly removed the mod, delete the folder "realbows" under 'textures/weapons' and delete any bow meshes with the following names:

daedricbowskinned.nif
draugrbowskinned.nif
dwarvenbowskinned.nif
ebonybowskinned.nif
elvenbowskinned.nif
falmerbow.nif
forswornbow.nif
glassbowskinned.nif
ironbow.nif
nordherobow.nif
orcishbow.nif
steelbow.nif