Adobe Flash Player For Mac Os X Version 10.10.5: How to Troubleshoot Common Flash Issues on Your Mac

I have imac (2009), version: OS X Yosemite, 10.10.5. How can I upgrade to the latest version. I have now problem with my computer, it suspends all the time, and it is very slow. Can anyone guide me what the best way to upgrade, please.

Adobe Flash Player For Mac Os X Version 10.10.5

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