OS 10.5 PowerPC Mac - Flash Player 10.1.102.64 and 9.0.289.0
OS 10.5 Intel Mac - Flash Player 10.3.183.90
Those are "zip files" with ALL builds of Flash Player for that version.
Pick the right one for your Mac (>About This Mac - to find out if it's an Intel or PPC)
Extract the files and select the DMG with the Flash Player installer.