To use the exercise file with Qiskit, you need to sign in to https://quantum-computing.ibm.com/ (sign up if you don't have an account), go to IBM Quantum Lab, then import the files from "Qiskit_questions.zip" into this online directory. You should be able to run both scripts there (questions one and solutions script: "Qiskit_solutions.zip" which will be made available after exercise ends.). Similarly with Pennylane, you just need to instead login to https://cloud.xanadu.ai/ and then go to Notebooks. You then import the files from "Pennylane.zip" and run them.