It is necessary to install the plugin. Full offline installers have at https://helpx.adobe.com/ru/flash-player/kb/installation-problems-flash-player-windows.html
It is necessary to download the file https://fpdownload.macromedia.com/pub/flashplayer/latest/help/install_flash_player_ppapi.exe
After restarting the plugin to appear in the browser menu. After the upgrade, the browser may have to repeat it.