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I'm USA also. Package Manager has continued to work properly for the past week. It's possible it was something on my end that changed to fix...
The package manager is fully working for me today, even in older versions such as 2018.3.3f1, on both Mac and Win. I hadn't tried for several...
I just tested this on an office network, and it's working for me here. I had actually already tried using my cell phone as a hotspot from home...
I have the same problem on 2018.3.1f1, 2018.3.3f1, 2019.1.0b1 on both Windows or Mac. The older version of package manager in 2018.2.20f1 works fine.