While Apple works on restoring lost functionality to iWork many will want to continue to use the old ’09 versions. The problem is if you need to install them on a new machine. If you’ve already downloaded ’09 (or have the DVD) then there’s no problem. Even when ’13 was installed it kept the ’09 versions in a subfolder. Apparently if you have a pre-Mavericks machine and try to download Keynote, Pages or Numbers it’ll offer you the ’09 version. However if you are on Mavericks and never have had the ’09 versions I don’t know if there’s any easy way to get the ’09 versions.