At some point I'd posted some method for patching a Flash player so it would appear as 11.5.502... and thought to try & find it among previous discussions; and for some reason I could only go back 500 discussions. So I did not find that post.
Given the Flash player is essentially obsolete for the outdated OS X version(s) the patch is a way to allow some sites and some content to load in a browser that otherwise may not. However because it is not improved regularly, there is content that probably won't work even if you use the patch and run a later version.
The instructions are in a read-me richtext file in the patch folder; the Plugin update is included and you swap out the older plugin with a newer 11.5.xx included in the download file. It seems to do OK and my older Macs can use it. (Even my early Intel-based MacBook with Leopard 10.5.8 has a patch, since it hasn't a current Flash either.) See their 'read first' file to see what you need to do to get the patch to work. Save the old part in another folder so you could revert it. And test the Flash player version after the patch update. This does not use a regular installer; you re-use part of the existing Flash player
•adobe flash 11.5 for PPC patch:
http://scriptogr.am/nordkril/post/adobe-flash-11.5-for-powerpc
You can use the Adobe Flash Player help site to test a version, get another (vintage) version in their older version section archive; or test a version in any Mac that can go online to see what (if any) is running in it.
•Flash Player Help - Adobe Flash Player:
http://helpx.adobe.com/flash-player.html
For more regular problems with an Adobe Flash installation
(not related to a patch issue) this also offers troubleshooting:
http://helpx.adobe.com/flash-player/kb/installation-problems-flash-player-mac.ht ml
Given the moving-target nature of the internet web page content, browser and OS
technology update or change, and obsoletism of various products, you cannot
expect these items to last; you will have to upgrade the system at some point, and
because the hardware limits you in PowerPC (and other) a newer computer device
is another prospect if you require an online presence and need Flash player plugins.
You could try other web browsers, re: iCab http://www.icab.de/dl.php (runs Demo)
Latest SeaMonkey for PPC: http://sourceforge.net/projects/seamonkey-for-ppc/
TenFourFox no longer sees Flash player. http://www.floodgap.com/software/tenfourfox/
FireFox is no longer supported past an old versions in PowerPC Mac 10.4/10.5.
Some video content uses HTML5 so you can check to see if any browsers you use
can be adapted to more readily try to use that when available and not rely on Flash.
•YouTube HTML5 Video player:
http://www.youtube.com/html5
•HTML5 Video Player Comparison
http://html5video.org/wiki/HTML5_Video_Player_Comparison
Hopefully you may be able to make use of these items.
Good luck & happy computing! 🙂