I was just trying to download Factorio and was getting a pause followed by an error page. After some head-scratching, I determined that the client machine in question has broken IPv6 connectivity. It was trying to connect to the download servers over IPv6, failing, then eventually switching to IPv4....

Please consider S3 + CloudFront. It's less admin work than running your own CDN (probably faster too), and it's still cheaper than using S3 directly.

Big fat warning: I just noticed that my Factorio.app says it's 0.10.5, and that there are no updates available despite Experimental Updates being enabled, even though I swear I downloaded the experimentals after seeing a note saying that 0.10.6 was out and reasonably stable. Sigh. I just re-downloa...