Try the alternative install instructions at http://community.wd.com/t5/WD-My-Cloud/How-to-Install-Bittorrent-Sync-on-the-WD-My-Cloud-Windows/td-p/655255
ie download the power pc for MyBook Live - not the ARM. unzip the file (you will probably need to do it twice - unzip the gz-file and you will get a .tar file that needs to be unzipped again.
Copy the btsync file to the Public share and follow the instructions at the link above.
One problem is the web GUI that does not show up with the latest version. But you can find instructions for that here
http://forum.bittorrent.com/topic/31280-blank-gui-after-update-to-14/
