You can solve the assignments in the manual by using the simulation of the process and controller, which looks like this:

Lab tank simulation GUI

The simulation is a Matlab script, which can be downloaded here: tank_sim.m Instructions of how to get it working are given below:

If you don't have Matlab installed on your computer, download it from here: Software LTH and install it.
Download the simulation script file tank_sim.m and open it in Matlab.
Make sure that the file path is set to where you saved the script file.
Click the "Run" button.

If any problems appear, you can try to close the window and run the script again.

Speed-up option

With the buttons "2x Speed" and "3x Speed", you can speed up the simulation 2 or 3 times. If you activate both at the same time, you will speed it up 6 times.