What? You have not provided any system information, details on what you actually are trying to download, what browser and so on. You need to do a lot better and explain properly.
I have a mac os-x. flash player 15 . downloads to my download storage but won't install unless I buy an app for $9.99 which I do not want.
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"blocked plugin" means you are using an outdated Flash Player version; Apple/Safari will block anything older than 22.214.171.124.
You do not need to buy anything to download or install Flash Player; best use the offline installer http://download.macromedia.com/pub/flashplayer/current/support/install_flash_player_osx.dm g
If you install using the offline installer and you still get the blocked plug-in message, do a full uninstall/reinstall. That usually solves it.
Run the uninstaller: Uninstall Flash Player | Mac OS
Then run the installer you downloaded earlier.