Thanks for posting a Mac Bullroarer Client again.
OSX Yosemite 10.10.3
The Mac Client download has at least one, possibly two problems related to Apple's Gatekeeper software.
1- Upon launching the file: "The Lord of the Rings Online™.app" verification of the Disk image begins and it immediately pops up with
"The Lord of the Rings Online™.app" can't be opened because the idenity of the developer cannot be confirmed."
This is with Apple's default security settings: System Preferences/Security & Privacy/General -- "Allow apps downloaded from "Mac App Store and identified developers only."
2- Simultaneously a second pop-up from Mac Help appears: "The app has been modified or damaged"
If you acknowledge the initial pop-up by clicking "OK" the Security & Privacy panel will immediately add: "The Lord o...nline™.app" was blocked from opening because the identity of the developer cannot be confirmed. A button is provided "Open Anyway."
Verification of the Disk image continues and adds the pop-up ""The Lord of the Rings Online™.app" is an application downloaded from the Internet. Are you sure you want to open it.
(Should you click "show web page, it goes to Turbine.com, rather than LOTRO.com)
Clicking Open allows to activity to continue until it crashes to the desktop:
Process: lotrolauncher [43971]
Path: /Volumes/VOLUME/lotroLauncher.app/Contents/MacOS/lotrolauncher
Identifier: com.turbine.lotrolauncher
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Will file a bug report as well.
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Correction on crash -- as one can notice from above, being a dunce, I tried to re-launch the installer from the .dmg file instead of the /Applications directory. Naturally it will crash as the .dmg file is read only!
Duh!
Launching from the /Applications directory, the download proceeds as expected after the Gatekeeper bypass indicated above.