Where are the Flash temp/cache files in safari 9? They move every version
In the past it used to be possible to find cached Flash video files and retain them.

However that doesn't seem possible in recent versions. There are a few "Cache" folders created if you install Flash Player (or use the one bundled with Google Chrome), but when a Flash video is actually playing the data appears to be written temporarily to a location similar to /private/var/folders/t5/zp1103fj4h924mvzysl1m9wh0000gn/T/FlashTmp.T6ja08 but it doesn't stick around long.