So it appears that Adobe has made some changes on the fpdownload.adobe.com server. Trying to get the binaries for Flash Player 18.104.22.168 this morning and was presented with a 404 error. Visiting http://fpdownload.adobe.com redirects to the End of Life (EOL) for Adobe Shockwave statement which specifically states:
Effective April 9, 2019, Adobe Shockwave will be discontinued and the Shockwave player for Windows will no longer be available for download.
Either they had an overly-enthusiastic system administrator who purged too much or they are moving to a model where only the most-current versions of their products will be available for general download.
Anyone have more insight they can share? Luckily we keep an archive of all referenced binaries so I was able to just pull it from there, but I’m sure a lot of folks don’t have that luxury.