From the official website:

“When we joined forces with Canva, we pledged to make Affinity free to all eligible K-12 teachers and schools. Here’s everything you need to know to download and access Affinity for free…”

For more check the website: https://affinity.serif.com/en-gb/affinity-canva-free-for-schools/

This includes Photo 2 / Designer 2 / Publisher 2!