Luma doesnt care wich region you are. It bypasses the regioncheck for installing stuff.
Maybe the File is corrupt, redownload or try different source.
Did u checked u get the right one for your indstalled game? Check in FBI the Game title ID and then Check the correspondending ID of the Update that are both same region.
For example:
Game title ID 00040000001B5000
Update title ID 0004000E001B5000
DLC would be 0004008C001B5000
Game Demo 00040002001B5001