He's already said he's not going to. Why did anyone think he was actually going to? He's already removed a couple of his campaign platforms off of his website too. The most outlandish things that the extreme far right supported-- yep, they're gone. Just as any moderate with a brain thought they'd be.
Be angry at Clinton all you like, but it really isn't worth the additional money to attempt to go after her (again). Millions have already been wasted and in the end she is not likely to ever see a jail cell. A smart businessman knows this and isn't likely to waste the money nor the effort.