[CentOS] Downgrade an rpm

[Tom Brown]

> That is what I suspect. I presume I have to block it from being upgraded after as well. How can I force the new app back in without worrying about this dependency?
>
>   

to prevent a package from being updated or installed from a certain repo 
you'd add

exclude=package_name

to the yum config for that particular repo - that way if you add it to 
rpmforge and the package exists in rpmforge and base then the 
installation and or update would occur from the base repo.