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I did not respond to you because:

• I could not reproduce it from different servers across the world.
• There were no requests matching this edge status code in our CloudFlare CDN logs.
• There were no reports about something even remotely similar by anyone else.
• The rate of downloads of our software has been steady and within historically expected volume.
• The overall site traffic has been normal and within historically expected volume.
• HTTP 413 makes no sense in the context of downloading our software since that's a GET request, whereas HTTP 413 only applies to requests with a payload, such as POST and PUT.

This very strongly indicated that it was something on your end, very likely a cock-up in your server environment (if I were to guess: there's a caching proxy for HTTP requests made from your server to the Internet) with a very good chance that it would resolve itself given time. Given the fact that it's a non-emergency issue we have nothing to do with, and that by the time I had checked all that it was almost time to log off for the weekend, I did not see a reason to reply out of our working hours.

Redoing Friday's fact-finding and troubleshooting today I see that nothing has changed. Therefore, I conclude that this is something on your end.