ProBuilder failed to fetch package size

Hello, everyone,
I’m new in this community.
I’ve been stuck in installation of ProBuilder for 2 days, it says “Failed to fetch package size: can’t connect to “undefined”(error code: ECONNRESET)”.
I’ve search everywhere I can, but I couldn’t solve this problem. I tried some different types of Internet connections, but it didn’t work out.
So I hope that u kind guys could give me some advises please. Thanks in advance.

forgot to patch a capture…