Not sure why, but ~/Library/LaunchAgents/ does not exsist on my system, so the core helper installer failed silently, as it no error, just “I failed”
Manually creating the folder fixed the issue.
Thanks a lot for reporting! Will solve is in next update version of Core Helper.
Fixed in Core Helper Installer 3.0, the installer will create the folder ~/Library/LaunchAgents/
when necessary.