Hi Iria,
Powerpoint is rather essential, not just for this course. How much effort have you put into obtaining a copy?
I googled "how to get powerpoint for free" and found this:
https://en.softonic.com/articles/7-tricks-microsoft-office-free
Step 3 looks relevant to you.
Doug
PS You should select one target, as long as it's not PFKFB3.