can confirm this for both versions of (NSFW) https://altosandherdone.itch.io/the-headmaster/
the browser downloads a too-small version, and the app just struggles and restarts the download after 10-20% "progress"
UPDATE clicking the Downloads not starting? link and switching to alternate download mode has been successful. Suggest changing the text of this link to "Downloads corrupted or not starting?" or putting everyone on "alternate" download mode by default.