I had the same problem, updating Flash in OS X 10.11.6 (El Capitan), and the solutions posted here didn't work, including the accepted solution from May 2016 pointing to 'distribution3.html' at Adobe, which currently (Nov 2016) redirects to a new page providing only the web installer. OS X 10.11 El Capitan only runs Intel CPU-compatible software, so El Capitan will not allow CS2 to run or install. Adobe CS3, CS4, and CS5 applications should run, but Adobe does not officially support them on El Capitan and there may be problems.

Last updated: October 18, 2017

There are several reasons why you may want to uninstall Flash Player from Mac. It could be that you had an unsuccessful or corrupt installation of Flash Player that is not working. Or maybe you just want to remove a known installation of Flash Player from your Mac because it is a security concern, or is just no longer required. First of all, check to see which version of Flash is installed, if any. If Flash Player is not detected on your Mac, then there is no reason to proceed with the uninstall process.

If there was detection of Flash Player on your Mac, the information below will show you how to remove it. The process involves downloading an uninstaller program from Adobe, closing any applications that may be in use on your Mac that use Flash Player (such as web browsers, for example), and then restarting the computer. Before getting started, make sure you have the correct permissions to download files to your Mac, and save any unsaved work in your open applications.

The following information about how to uninstall Flash Player from Mac pertains only to Mac OS X 10.6 and later. Consequently, that means this information is only for Snow Leopard, Lion, Mountain Lion, Mavericks, Yosemite and El Capitan users. The uninstall program from Adobe referenced in this article is specific only to these Mac OS X versions. If you’re not sure which version of Mac OS X you are running, click the Apple menu, and choose About This Mac. The Mac OS X version will display in the About This Mac dialog.

Download and Run the Uninstaller Program

1. Download the official uninstaller program for Flash Player from Adobe for Mac OS 10.6 and later (Source: fpdownload.macromedia.com).

2. Click the Downloads icon in Safari (or your web browser of choice) to open the Downloads window. Double-click the uninstaller program item in the Downloads window to open it.

3. A new Flash Player dialog will open. Double-click the Adobe Flash Player Uninstaller icon to run the uninstaller.

4. You may see another dialog open that warns you that “Adobe Flash Player Uninstaller” is an application downloaded from the Internet. Are you sure you want to open it? Click the Open button.

5. A new Adobe Flash Player Uninstaller dialog will open. Click the UNINSTALL button. Input an administrator password if prompted to allow this program to run.

If you had any doubts about whether the uninstaller would run if you ignored the part about closing the open applications that use Flash Player, you will see this dialog:

Once you close the conflicting applications, click the Retry button to continue. When you see Adobe Flash Player was removed from your system, click the Done button.

6. Once the uninstaller has completed, you will need to attend to some directory clean-up. This involves navigating to these specific directories on your Mac, and manually deleting them:

.../Library/Preferences/Macromedia/Flash Player
.../Library/Caches/Adobe/Flash Player

Flash Player Mac Os X El Capitan

7. Finally, to complete the process, restart your Mac. Once your Mac has restarted, open a web browser to verify that Flash Player is no longer installed.

You may have interest in these helpful Flash Player articles:

How to uninstall Flash Player from Windows
How can I see which Flash Player version is installed?
How to update Flash Player on your computer

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Adobe Flash Player Os X El Capitan

Flash Player Osx El Capitan Mac Os

This isn't exactly a problem to be fixed as of yet. But rather information research. I've read several viewer comments &/or articles from other sites about the ongoing security issues if one uses Adobe Flash. But when I play videos on websites or youtube videos, I have to activate the adobe flash player (an option I opted for in the add-ons). I keep it updated but am wondering if there is an alternative program that Firefox will support on my Mac using El Capitan. I'm not computer savvy enough to understand what it means that some favorite website have already shifted to HTML5 videos or alternative technologies (not exact quote). Are there any suggestions? Or am I not asking the right question?