Analog Clock Construction Kit

No, you do not install anything.

Instead, you take the code shown as a basis for your own clock implementation - e.g., by copying it into the right-hand side of the Web IDE.

Then you choose the parts you like and copy their require statements as described in the part's documentation.

If everything is correct, you may just upload your code to your watch in order to test it. If your clock meets your expectations, you may save your code into a file, e.g. app.js (on your PC) and add any other files needed to complete a regular app (I may provide templates for these files as well). Then fork Gordon's BangleApps repo and add your clock to the list of apps.

Et voilà, you made your very own and personal clock! After a pull request, this clock is even available for others as well - clock implementation made simple!