Wow, I went to that site and after trying to find the product, I guess Photoshop Element 2018, even though I have 2020. The explanation is so confusing I really don't know if the answer is there, but it is very hard to understand.
Just to be a little more precise, you can install the program on as many computers as you want. But you can only activate the program on two computers at a time. And you can only use the program on one computer at a time.