[CentOS] libplasma - no downgrade

I tried, last night, to downgrade kdelibs, I think it is, to resolve the
libplasma crash that we talked about yesterday... and yum told me there
was no upgrade or downgrade. I'm sort of assuming that I'd have to go back
to 6.4... unless I need to add a repo - the vault? wget it, and downgrade
it locally?

      mark