How to install new Recovery image from .img file

I recently found that I could upgrade to the new CWM touch recovery version for my EVO 4g! However, to do this through the ROM manager app or get it directly onto the phone at all, it required a payment, although they specified it could be found (the same version) for free on their website. So naturally, I went and downloaded it as soon as I could. But instead of a .zip file, as things that I usually flash, it is an .img file. This made sense, since I figured I wouldn't be installing a new recovery through the current recovery version, but I am unknowing as to how to install this new recovery image. Anyone know what my next step is?