As long as you are using python 3 (I use 3.6.3), It should work. If it doesn't, report a bug!
After cloning and creating your own local repository, just run timeClock.py.
After running timeClock.py, you will be promted by the CLI to either run a command, or type HELP for more info.
Until you get used to the CLI, I'd recommend typing HELP as it lists out all of the possible commands.
To start a new project to track, type START. You will then be prompted to enter a project name. After that, TimeClock will start tracking your project. This is when you would be working on your project.
After you are done working on your project, type STOP- TimeClock will now stop tracking your project. Don't forget to stop your projects as TimeClock won't have a reference point for the end of your work session and thus won't be able to calculate the amount of time you've spent on your project!
When you're all done tracking your projects and what not, just type QUIT or you can close out of the command prompt.