Yet, SE still told people to uninstall the beta client to prevent issues with the retail version.
It doesn't only relate to the PC platform but the consoles as well... It depends on the install software and how it unpacks and installs the files etc.
Common sense says, uninstall any beta EVEN on the consoles, before installing the retail version to avoid any issues/crashes between the codes from the beta and the retail version...
Also, setting your game to run under admin rights doesn't guarantee it'll work for everyone...