In the latest mac catalina system, has been renamed from karabiner to karabiner-elements, installed version is Karabiner-Elements-12.9.0
Download: https: //pqrs.org/osx/karabiner/
After two applications will be installed, one Karabiner-Elements, a is Karabiner-EventViewer, keys used to modify the Karabiner-Elements
When installed will be prompted to add permissions
You can import after installation at the following URL key combination you want to modify the program, the key combination is complex_modifications, a single key is simple_modifications
https://pqrs.org/osx/karabiner/complex_modifications/#modifier-keys
For example, I would swap the command + tab and ctrl + tab
External keyboard to modify the position of ctrl command option
