Application error, "cannot save data files" after downloading update

Hi All,

I've been running the Lord of the Rings Online Game with no problems using 10.10.3.. A few days ago I began receiving an error: "cannot save data files" within the application after it downloaded an update and tried to install the patch. Their technical support is not very familiar with MAC OS X and I've wasted hours following their suggestions. They think Gatekeeper is disallowing access, but I don't know what to do about that. I've tried running the update process from admin and standard user accounts. I've de/reinstalled the app (4x) and run the update (4x) using both standard and admin accounts. I've checked that all the permissions to the app and subfolders are correct and I've verified I'm allowing apps downloaded from anywhere. I don't run any antivirus apps and I'm not running any other security software. I seem to be downloading the application update files fine, but the OS isn't allowing them to be saved. Any help would be most appreciated. Thank you.