Install using Command Palette (in VScode and forks)
Go to View -> Command Palette or press Ctrl+Shift+P;
Then enter Install Extension;
Alternatively: if you have this theme on disk, you can choose Developer: Install Extension from Location... and select a folder with it. Skip steps 3 & 4 in this case.
3. Type Serika Pro;
4. Select it or press Enter to install.
Activating theme
Run Visual Studio Code. The Serika theme will be available from File -> Preferences -> Color Theme or Ctrl+K+T dropdown menu.