On a Mac, unable to install latest Flash Player 12.0.0.44--or reinstall previous version that worked

I am on a Mac running the last version of Snow Leopard before Mavericks, 10.8.5.  I am unable to install the new Flash Player 12.0.0.4--at about the 50% mark on the installing bar, it stops and I get an error message that installation failed.  The version I had previously for some time, either 10. or 11. worked perfectly but I am not unable to reinstall any previous version either.  So I have a project I cannot run that requires Flash Player and can't watch videos. 
I found someone in a forum who mentioned he'd seen several people on Snow Leopard unable to install Flash Player but his directions to overcome that which did work for someone who tried it, appear to be for PC's: from his first direction of right-clicking, I didn't get the option he says to click on that starts the process.
Can anyone tell me how to install this new Flash Player in a Mac on Snow Leopard?  Should I trash all the new versions of the installer and the Flash Player Debugger Version 11.4.402.287 (11.4) that I have from a previous installment, prior to trying again?
Thanks for any help.

What I'm looking for is specifically the "General Installation Error", since it's 10.8.5.
You're missing a file that was made visible by the 10.8.5 update. Hundreds of thousands of Mac users all over the world deleted it, not knowing what it was. It causes this when it's missing.
Download this file: "Secrets" pereference pane
And this one: mach_kernel.zip
Install Secrets, and open your System Preferences.
Open the Secrets Preference Pane, and check "Show hidden files"
You'll need to press the "Quit this" button,
and restart Finder, by right clicking the Dock icon.
Then, place the mach_kernel.zip file in the Mac HD directory,
and unzip it. You should see a "faded" mach_kernel file appear.
Trash the zip file.
Reopen your System Preferences and uncheck "Show Hidden files".
Instead of quitting Finder and relaunching it, reboot your Mac.
Your Flash Player installer won't quit anymore.

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