Adobe flash version for os x 10.5.8 which is most stable??

Depends entirely on what Mac you have.

You can check here: http://www.adobe.com/products/flash/about/ to see which version you should install for your Mac and OS. Note that version 10,1,102,64 is the last version available to PPC Mac users*. The latest version,10.3.183.23 or later, is for Intel Macs only running Tiger or Leopard, as Adobe no longer support the PPC platform. Version 11.4.402.265 or later is for Snow Leopard onwards.

(If you are running Mavericks: After years of fighting malware and exploits facilitated through Adobe's Flash Player, the company is taking advantage of Apple's new App Sandbox feature to restrict malicious code from running outside of Safari in OS X Mavericks.)

* Unhelpfully, if you want the last version for PPC (G4 or G5) Macs, you need to go here: http://kb2.adobe.com/cps/142/tn_14266.html and scroll down to 'Archived Versions/Older Archives'. Flash Player 10.1.102.64 is the one you download. More information here: http://kb2.adobe.com/cps/838/cpsid_83808.html

You should first uninstall any previous version of Flash Player, using the uninstaller from here (make sure you use the correct one!):

http://kb2.adobe.com/cps/909/cpsid_90906.html

and also that you follow the instructions closely, such as closing ALL applications (including Safari) first before installing. You must also carry out a permission repair after installing anything from Adobe.

After installing, reboot your Mac and relaunch Safari, then in Safari Preferences/Security enable ‘Allow Plugins’. If you are running 10.6.8 or later:

When you have installed the latest version of Flash, relaunch Safari and test.

If you're getting a "blocked plug-in" error, then in System Preferences… ▹ Flash Player ▹ Advanced

click Check Now. Quit and relaunch your browser.

If yours is an Intel-based Mac, then your more stable Adobe Flash plugin or player would

be available to a newer Mac OS X operating system; an upgrade (if supported by hardware)

to Snow Leopard 10.6 by use of retail install DVD, & update to 10.5.8 via Software Update

is the path to getting a later (but not latest) version of Adobe Flash and more recent S/W.

Since Leopard 10.5.8 is the last OS X system the older Power PC (pre-2006) Macs can

run, without any more help than the Question you ask and the Thanks, we're unable to

do much more than write a whole bunch of words with links for you to read up about it.

This first link covers several items, including a path to find & download the correct vintage

Adobe Flash for older Mac OS X versions. Both links may cover similar ground to a point.

Be sure to read through article(s) to see where they best match your circumstance; they

were intended to apply through a larger range of issues & system versions than yours.

•Adobe Flash Player Help - Installation problems - Mac OS X:

http://helpx.adobe.com/flash-player/kb/installation-problems-flash-player-mac.ht ml

•Adobe Flash Player - Flash Player Help:

http://helpx.adobe.com/flash-player.html

If you have an older PowerPC (not intel processor core duo, etc) the limits as stated by

Klaus earlier post are about it. There is a patch by a third-party to make a vintage PPC

Mac running Leopard 10.5.8 (or Tiger 10.4.11, maybe) be able to trick the browsers

into seeing the older version as a slightly later version. Any 'last supported' Flash player

would be a stable version. Without more info supplied by you, there isn't much to say!

Good luck & happy computing! 🙂