The Efergy eLink 2.0 for Mac fails silently on installation. Upon inspection the installer has permissions problems - use Console application to see these.
12/12/11 10:46:50 PM com.apple.launchd.peruser.501 ([0x0-0x9e09e].com.bitrock.installbuilder) posix_spawn("eLink V2.1 for Mac.app/Contents/MacOS/installbuilder.sh", ...): Permission denied
12/12/11 10:46:50 PM com.apple.launchd.peruser.501 ([0x0-0x9e09e].com.bitrock.installbuilder) Exited with exit code: 1
Make it work
The fix for this was rather simple. Open up terminal, move to the directory where you extracted the installer and issue the command:
sudo chmod -R 777 eLink\ V2.1\ for\ Mac.app/
Once this is done continue with installation. Once the initial installation is done install the TWO drivers from the mounted drives and reboot.
Now it works. Or worked for me.