I'm running Windows 64-bit using Netscape and Edge browsers.
I got a pop-up telling me that there was an update for Adobe Flashplayer,
so I'm trying to install the update. My question is, what are the differences
between the EXE files as I've downloaded several different files in my attempts:
I've looked a the FAQ and searched the forum, but I don't see an answer to this question.
flashplayer32pp_fb_install.exe is the PPAPI plugin for Chromium-based browsers. Since you indicate you're using Netscape and Edge, this is irrelevant to you and can be deleted. If you do happen to use Chrome, there is no need to install Flash Player separately as Google embeds Flash Player in Chrome
flashplayer32_xa_install.exe and flashplayer32au_ha_install.exe are both NPAPI plugin for Netscape-based browsers (Firefox, Safari). The first file name means it was downloaded directly from get.adobe.com. The second file name indicates it was downloaded from a Update Notification prompt. Essentially they are the same file, just different file names.
For Edge - Microsoft embeds Flash Player in Edge/IE and all updates are distributed by Microsoft via Windows Updates.
Note that all major browsers block Flash Player by default. To enable Flash Player in the various browsers see https://helpx.adobe.com/flash-player.html
Important note: Adobe® has announced that Flash® Player® will be deprecated in December 2020. In Chrome 76 and later, Flash Player is turned off by default. Users can manually switch to ask first before running Flash, without impacting policy settings that you set for Flash. For details about shipped and upcoming changes, see the Flash Roadmap.
We strongly encourage organizations to migrate to alternative solutions.
By default, Chrome installs Adobe Flash Player in the background or the first time that a user encounters Flash content, and Chrome will continue to update Flash Player via the Chrome Component Updater.