Can you get a software update to upgrade to Android Auto/Apple CarPlay?
No, it is not currently available as a software upgrade in the European market.
Why can 2016+ Hyundai Tucson models in the US download a software update to update the console system to include Android Auto/Apple CarPlay and Irish models cannot?
Whilst the Hyundai Tucson is a global car; it is produced in different factories for different regions; and this means that there can be small variations in the component parts on different continents. The ability to update the console in the US and get Apple CarPlay / Android Auto is unfortunately just not possible in the European Tucson.