Custom Zbrush 2019 UI - Theme does not include MatCaps they are sold separately.
To install just follow the steps:
1. Open Zbrush 2019,1
2. On the top menu go to Preferences.
3. Click on the menu and select 'Config' first tab top to bottom.
4. Click on Load UI.
5. Store UI and done.
Please enjoy it! Feel free to give any comments and feedback.