If you own a Nintendo 3DS and have a Nintendo account, you can check the Nintendo eShop for Pokémon Omega Ruby. Sometimes, if an update is available, it will be automatically downloaded when you purchase or re-purchase the game. Make sure your 3DS is connected to the internet and go to the eShop to see if any updates are pending.
The for Pokémon Omega Ruby and Alpha Sapphire was primarily a maintenance patch released to improve the overall gaming experience by fixing known bugs. It is a critical update for players who wish to access online features, such as the Player Search System (PSS), Wonder Trade, and the Global Trade Station (GTS). Key Details of Version 1.4 Pokemon Omega Ruby Version 1.4 Download