You may have to clone the repository to get the demos folder. Otherwise it's perhaps somewhere depending on how you use python (global and often broken environment, virtual environments, conda hell, etc…).
I feel like Python folks are on average terrible at distributing software. So many projects have some python script to install the dependencies, still assume you use conda, or don't bother to specify the dependencies versions. Thankfully it's often the same patterns and after some time you understand what to do based on the error messages. But I wish they could use something like NPM or Cargo. Even something like Maven would be an improvement.
I feel like Python folks are on average terrible at distributing software. So many projects have some python script to install the dependencies, still assume you use conda, or don't bother to specify the dependencies versions. Thankfully it's often the same patterns and after some time you understand what to do based on the error messages. But I wish they could use something like NPM or Cargo. Even something like Maven would be an improvement.