They all seem to work for me now. Maybe the website was down when you posted this comment? See if you can follow the links now.
Viewing post in Free Pixel Art Tileset - Summer Forest comments
So, weird thing is, I was able to access them only with a VPN. I honestly have no clue why a public website wouldn't be available to a certain region (unless our government considers your content a national threat!). I forgot to mention in my last comment, but they have been like that for some months now, so yeah, very weird. It's not your fault, I'm from Brazil by the way, and they just don't load here for some reason. Thanks for the response and keep up the good work!