Canon MX521 Mac 10.14 Setup
Do you want to know How-to Install Canon MX521 on Mac Mojave 10.14?
The linked Guide shows you How to Setup Canon MX521 in macOS 10.14 Systems.
Canon MX521 How to Quick Start Printing on macOS 10.14 Mojave
Mac Mojave Canon MX521 Printing Quick Start Guide