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I'm using FireFox 53.0.3 on system Win7 64bit.
After AdobeUpdater noticed me about new version I opened the adobe webpage (for safety reason) and started update manually.
The installation started and stopped at 90% for a while. Then it noticed me that there has been an error and request to click but there is no link (see screenshot).
I followed the ErrorPage and tried installing the NPAPI-Version für FireFox manually. Installation worked till 100% but then the setup window freezes.
Then I've found this link: Flash Player Help
After click on 'CHECK' I now get the message that latest version is installed...
now I'm confused what happened..
Since the installation window froze at 100%, your installation had completed by that time. This is the reason when you click on Check button on https://helpx.adobe.com/flash-player.html page you see that your version of Flash Player is latest.