Tonight opening Numbers caused a free update available box advising me to install the latest version of OS X and then download the latest version of numbers. 'OK' is the only choice. Can't even shutdown. Don't want to lose task or upgrade to Yosemite

Tonight opening Numbers caused a 'free update available box' advising me to install the latest version of OS X and then download the latest version of numbers. 'OK' is the only choice.
I can't force quit Numbers or even shutdown the iMac.
I don't want to lose the spreadsheet (90% completed so far) or upgrade to Yosemite.
I have OS X 10.9.5 running on a 2014 iMac.
What to do?
Thanks.

NOTE: Just discovered that Adobe is making a bigger mess than any previously.
They now have a 32-bit uninstaller for Flash '''''AND''''' a separate 64-bit uninstaller for Flash. You will need the 64-bit uninstaller for what you had installed above.
*32-bit uninstaller: http://download.macromedia.com/pub/flashplayer/current/uninstall_flash_player_32bit.exe
*64-bit uninstaller: download.macromedia.com/pub/flashplayer/current/uninstall_flash_player_64bit.exe

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