I am not able to open ProjectLibre 1.5.8 or 1.5.18 in Mac OS X 10.6.8
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We mainly use the http://www.projectlibre.org forums for answering. Sorry for the delay.....
You can go back to the Files menu here on Sourceforge and you can see a .dmg download for either Java 6 or Java 7. You have the wrong version.
Thank you for the response. I found the file that opens on my Mac!