Had trouble downloading the Starfinder der core rule book earlier today. It’s only loading like 157 bytes or so and I can’t open it. Just encountered the same problem with the playtest beastiary
Thank you for letting us know! The Playtest Bestiary file should now be resolved (though you might need to click the "Problems downloading this file? Click here." link to reprocess the download). Will update when I have more info on the Starfinder Core Rulebook.