I've been having this issue with downloading beatmaps lately. When I try to download from the website, the page loads for a minute and redirects me to an error page.
I've checked some forum posts with related issues but none of the solutions seemed to work for me.
I tried using Mozilla, reinstalling Chrome, reinstalling Mozilla, clearing my cookies, reinstalling osu! and refreshing my router.
None of the standard beginner beatmaps seemed to download via osu!direct when I reinstalled the game, either.
I can still download maps through the beatmap packs, though. But come on. Multiplayer is basically impossible like this.
I don't know what else to do!