Trial Version Will Not Run on my Mac

I have been trying to use the trial of Lightroom 5 to see if I will convert from iPhoto/Aperture to Photoshop/Lightroom.  I belong to a digital photography club and we are evaluating "endorsing" a single platform so we can provide education and training for our members.  My trial version of Lightroom appears to download and install properly (Mac OS) but when I go to open it, I get an error message - "an error occurred while changing modules" and the screen remains at the shell of LR, showing the module list, the photo tray, and a big gray blob in the middle where everything else should display.   I have uninstalled and reinstalled twice - once when I hit "enter" after the error message appeared, the app started to load a catalog - I let it run overnight, since my iPhoto folder contains over 20.000 photos and I shoot raw much of the time.  The next morning, the pop up window stll said it was establishing a catalog and when I hit enter, that disappeared.  I have uninstalled LR, since it is not functional.  Can anyone tell me what I am doing wrong?

Hi me again i have just done the following 
9. Re: I get error message:An error occurred when attempting to change modules.
sam.am  Oct 2, 2014 2:27 AM (in response to gr8fulted)
Click on Finder and on the menu bar ( top side the of the screen) click on Go > Go to,folder
In the window type exactly ~/Library and click on Go
Open Application Support > Adobe and right click on Lightroom folder and select get info
Under sharing and permission Click on lock and unlock it
Click on + add your current user name and administrator if not added
Then give Read and Write permission for Admin, system, everyone and (your user name)
Click on gear icon and choose apply to enclosed item
Then Click on Lock
Launch Lightroom and check.
I get error message:An error occurred when attempting to change modules.
@    it worked for me good luck.

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