Additionally, the preinstall script makes assumptions about the version of flash plugin and its specific path

SYS_PLIST="$3/Library/Internet Plug-Ins/Flash Player.plugin/Contents/PlugIns/FlashPlayer-10.6.plugin/Contents/Info.plist"

The version may or may not be newer than the version this path is referencing, plus what happens when....

Oh I get it now, the Plug-In is always called FlashPlayer-10.6.plugin, of course.

Even though the version is 11.9 d900 . Great