Delete the ui(01).rpak and ui(01).dll from this location: Apex Legends/paks/Win64/...
The Apex Legends folder is where you installed the game (Which can be accessed via the EA App or Steam)
EA App:
- Go to your game library
- Press the 3 dots on top of Apex Legends
- Press "View Properties"
- Press the "Open Folder" button that's at the top of your screen
Steam:
- Right click the game in your library
- Hover over "Manage"
- Press "Browse Local Files"
From that point on you can navigate to the ./paks folder and then to the ./Win64 folder. Then delete the file in question.