Why can i not run Xplane 8 on my Mac OS X version 10.8.5

I am trying to run XPlane8 on my Mac, on the packaging it says that it requires MAC OS X v 10.3 or later, which I have.
now when I try to click on the install icon I get the following message.
You can't open the application Installer MacIntosh" because PowerPC applications are no longer supported.
Can yo uplease assist with this problem.

From the Safari menu bar, select
Help ▹ Installed Plug-ins
Besides the following, what plugins are listed?
iPhotoPhotocast
Java
QuickTime
Shockwave Flash
WebKit built-in PDF

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