BTW: This file will not be compatible with any other files that edit England, such as add ons that add lower leagues to the English league system.
Thanks to Rob for making this file available for FM18.
How to install No Brexit on FM19To install this file move the FMF file into this location:
Documents/Sports Interactive/Football Manager 2019/editor data
When you start a new game choose "Database" and select "!NoBrexit!.FMF" is selected.