Unable to download plug-in. "Problem installing post-install step"

Hello. I apologize in advance if this question has already been addressed but I could not find it on the boards. I am using a MacBook running Mac OSX 10.7.5. I downloaded the plug-in and followed the prompts. I received the following error message: "Problem running post-install prep. Installation may not complete correctly." After clicking on OK, the installation wizard completes and the disk image mounts, but "Arduino" appears nowhere in the applications folder. On the website, I get the error message: "We are not able to detect the installed plug-in." I have attempted to install it twice with the same result. Any ideas on how to correct tis would be most appreciated.

Not a "mac"person but very similar posts have been brought up before.

Have you gone through this section of the forum to read those ?

@jimmartin15 Do you have admin privileges on your Mac?