all extensions installed fine in DW CS6.
DW CS5 gave an error warning with an incorrect location . saying it couldn't open the shared.js file. error said the file was supposed to be in the Applications/Adobe Dreamweaver CS5/en_US/Configuration/Shared/Webassist/FreeTools.
after troubleshooting with CS6...
turns out the Free Tools folder is located in Library/ApplicationSupport/Adobe/Dreamweaver CS5/en_US/Configuration/Shared/Webassist/FreeTools
so I just copied the folder over and now it's fine.