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I have faced a strange problem when trying to install Adobe Flash Player for Mozilla Firefox (version 56) using the online installer. When you visit the official Adobe Flash download page, the Adobe server automatically identifies your browser and OS version, and its bitness. In my case, it correctly identified that I was using Windows 10 x64 and Firefox browser. So I was suggested Flash Player distribution for my environment.

Installation Problems Flash Player Windows 8.1

During the installation of the downloaded Flash Player (flashplayer26_ha_install.exe) installer file, the following error appeared:

Do you need the whole flash player or simply the flash player plugin for internet explorer or firefox? FlashPlayer-Plugin for Internet Explorer. FlashPlayer-Plugin for Internet Firefox. Doubleclick the downloaded plugin to install it. The original poster should always write the last response!!! Let us know, if the problem is solved!!! Hello I did not find the adobe flash player in my laptop windows 10, So, how to install it? And d not open some sites not responding maybe because of adobe flash player Waiting your help Thanks. Flash will be completely removed from all browsers by December 31, 2020, via Windows Update. Group policies are available for enterprise admins and IT pros to change the Flash behavior prior to that date. Companies reliant on Flash for development and playback of content are encouraged to remove the dependency on Adobe Flash prior to December 2020.

Application initialization error

After I clicked Finish, the downloaded file flashplayer26_ha_install was automatically deleted.

Having opened Flash Player installation log, Adobe_ADM.log (located in C:UsersUsernameAppDataLocalTempAdobe_ADMLogs), I found some strange errors of connection to Adobe servers and a certificate error.
11/18/17 11:31:10:788 | [WARN] | | ADM | | ApplicationContext | HTTPSend | | 7792 | Certificate not matching.
11/18/17 11:31:10:788 | [FATAL] | | ADM | | WorkflowManager | HTTPConnectorError | | 7792 | Error occurred while getting application xml: -4 extended error: 0

It felt like the installer could not connect to Adobe servers to get files. In this case, the solution was to download and install the full (offline) version of Flash Player distribution. However, it was very hard to find it on the official website. Having spent a long time searching, I managed to find the page to download offline installers of Adobe Flash for Windows: https://helpx.adobe.com/flash-player/kb/installation-problems-flash-player-windows.html

In my case, for Firefox browser I had to download Flash Player for Firefox – NPAPI (about 20 MB).

After that, Flash Player was installed without any problems.

Free Flash Player Download Windows