which program can be used to see flash player
Do you mean play Flash files? If yes then...
You can use a Standalone Flash Player aka Standalone SWF Player to play your saved .swf files. The one offered by Adobe can be found here under the name of Flash Player projector https://www.adobe.com/support/flashplayer/debug_downloads.html
If you wish to view them online I suggest you encourage sites you like to use Ruffle.rs to play back their swf files.
For sites that dont use ruffle.rs or offer a site specific solution I have had success playing flash files online in the Chrome browser with SuperNova SWF Enabler.
There is also the browser Puffin which is said to let one play flash files.