Installing a specific package version with yum

From the manpage:

MISC

  Specifying package names

         A package can be referred to for install,update,list,remove  etc
         with any of the following:

          name
          name.arch
          name-ver
          name-ver-rel
          name-ver-rel.arch
          name-epoch:ver-rel.arch
          epoch:name-ver-rel.arch

          For example: yum remove kernel-2.4.1-10.i686

You may have to manually remove the newer version and then install the older.

Use the upgrade option and specify the version number:

yum upgrade postgresql-8.2.10

Check the dependencies list before hitting Y. You might need to add other packages to the upgrade list.

A quick look at the man page revealed no such option. It seems they haven't added that yet; Yum is still a fairly young package manager.

Instead, download and manually install the relevant RPMs.

I have heard that the smart package manager can do this. (haven't had the opportunity to try it yet). Yum is known not to support downgrading.

smart is available on fedora.