Hi,
Download it from here: https://get.adobe.com/flashplayer/
Restart the browser after the flash player is installed.
There are many(5) Windows Flash Player versions:
Internet Explorer - ActiveX 21.0.0.197
Internet Explorer (embedded - Windows 8.1) - ActiveX 21.0.0.182
Edge (embedded - Windows 10) - ActiveX 21.0.0.182
Firefox, Mozilla - NPAPI 21.0.0.197
Chrome (embedded), Opera, Chromium-based browsers - PPAPI 21.0.0.197
SZ uses PPAPI.
If you have multiple browsers you need the appropriate flash for each.
Note: Flashes update notification will only update one of them, your current default browser. The rest you need to do, from each browser category, manually.