I think you have to use the DLM, but make sure you are still running firefox, wait for it to download. When you are asked t close firefox, search on your computer for recently changed files (name may be different): install_flash_player_64bit.exe (it's in a temp folder). Copy this to a different directory. You now have a standalone installer file. I tried opening the DLM installer w/ 7zip, but the contents are encrypted, so this was the easiest way.