The official and safest way to acquire the 1.4 update is through the on your Nintendo 3DS or 2DS system.
Yes – if you are a die-hard Hoenn fan playing on Citra, hunting down is worthwhile. The stability fixes in Mauville City alone save hours of frustration. However, do not fall for scam websites promising a direct "free download" of v1.4 with 10,000 downloads – these are often spam. Download Pokemon Omega Ruby 1.4
Are you planning to play this on or an emulator ? I can give you more specific installation steps for whichever one you are using. The official and safest way to acquire the 1
This is a separate patch file that must be applied to or installed alongside the base game. 2. How to Update to v1.4 Download Pokemon Omega Ruby 1.4