
Extract these files to the Mass Effect 3 folder in Origin's game install folder.Copy the file Mass Effect 3.z01 from disc 1 and Mass Effect 3.zip from disc 2 to a temporary location on your hard drive.By Default this is C:\Program Files\Origin Games\Mass Effect 3 Also, delete all files in Origin's download cache %PROGRAMDATA%\Origin\DownloadCache Delete all files in the Mass Effect 3 subfolder of Origin's game install folder.Start downloading Mass Effect 3 via Origin, pause the download and exit Origin.It is still possible to install from the DVDs using the following workaround: However, for those on slower or bandwidth-limited internet connections, this may not be a viable option. The first and easiest option is to simply download Mass Effect 3 via Origin. There are two possible solutions to this issue. It is impossible to continue the install process from this point. Further attempts to run the installation process will still prompt for a product key, and upon entering it will result in an error message stating the key has already been used. Despite this, Mass Effect 3 will now be activated in your Origin library.

After starting the install process and entering the product key, an error message claiming it is not a valid Mass Effect 3 serial number appears. Some users experience issues installing Mass Effect 3 from a retail disc.

