Downloading problem when installing Jetpack4.2 on tx2

I followed the steps to install Jespack4.2 on tx2.
But when step3, the download progress bar is always 0.00%.
How to fix this problem?

Hi Jesse,

Can you please let me know the SDK manager client version on your machine and attach ~/.nvsdkm/dist/sdkml3_jetpack_l4t_42.json?