I am having trouble updating or re-installing my adobe flash player on apple laptop. I checked preference on safari to ensure there were block on plug-in. The update says it has failed or keeps asking me to close safari.
There are some dashboard widgets and things like Skype that keep Flash Player in-use on the latest MacOS.
If you go to the Apple Icon in the upper left of the screen, then to Force-Quit, you should get a list of apps that you can quit.
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