Can't download jetson OS image

I tried to download jetpack 4.4, except for Jetson OS image,everything else has been downloaded. I spent another week trying to download Jetson OS image, but it was still unsuccessful. So I tried to download 4.4.1 and 4.5, but the result was the same.What should I do now?

Are you asking that you cannot access the server?

Maybe it’s this problem. When I install it through SDK manager, the problem displayed on the terminal is that connection timeout.

We don’t receive any report about that recently. Please try different network environment or VPN to see if you can access the server.

OK,Thanks for your reply!