I just found this petition to bring the Harry Potter games to digital distribution on Origin or Steam. It's really close to meeting its goal, and the best place I can think of to share the link to get it to its goal is on the speedrun forums. If you'd like to see the games on PC digitally please consider signing the petition.

https://www.change.org/p/wb-ea-digitally-distribute-the-harry-potter-video-games