If it was just unable to network reach the package
repository maybe trying again later could work.
I think it can be unclear whether that is the case or it failed trying to load a package.
The download of the package information stopped at just 114KB (of
several MB), according to the screenshot. That looks like the
connection got dropped.
Hence, the suggestions of starting with the package manager in offline
mode or using a different mirror.
Based on the OPs email/screenshot, I presume OP is located in China.
From what I recall, access to sf.net
from China was patchy in the
Dept. of Computer Science
University of Waikato, NZ
+64 (7) 858-5174