... Well, fortunately things aren't yet as dire as you pictured them , all thanks to web.archive.org
The URL https://helpx.adobe.com/flash-player/kb/archived-flash-player-versions.html has been captured 187 times in total, the last time "valuable" content was still in was on July 18th 2020 (https://web.archive.org/web/20200718192527/*)
The last version of Adobe Flash Player without the 2021 timebomb was/is 32.0.0.371; WAO have actually captured the following URI
https://fpdownload.macromedia.com/pub/flashplayer/installers/archive/fp_32.0.0.371_archive.zip
5 times, last one was on June 30th, 2020 (https://web.archive.org/web/20200630185943/*) ; the zip archive itself is at 388 MiB, so it'll take a while to come down from WAO... It contains all possible flavours of installers/packages, no need to search further...
Don't make that mistake again...