Keynote and Pages

You can only get an older version of Keynote/Pages/Numbers from the Mac App Store and then, only if you had installed it previously since Oct 2013. In this case, you would launch the Mac App Store, use the identical Apple ID used with that earlier installation, and press cmd+0 (zero). That opens the Purchased panel and if the application appears there with an install/update button, or a blue-outlined cloud icon, then click that. You will be presented with a dialog offering to install the last compatible version of these applications for your installed operating system.

Otherwise, if Pages/Numbers/Keynote were preinstalled by Apple, or you never installed these applications from the Mac App Store, then you are done, as there is no other means to obtain them, and you would need to use the iCloud versions of these applications.