Error updating Dart folders

I get the following error when trying to update the pub to install the web_ui package.

Dart Editor Version: 0.2.10_r16761

Dart SDK Version: 0.2.10.1_r16761

"Help > About > Check for Update..." also gives me "Unable to get latest revision" . Is this a possible problem with the proxy server?

Is there a manual way to add packages, for example. download the package and put it somewhere?

 Running pub update ... Pub update failed, [1] Resolving dependencies... Got socket error trying to find package "web_ui" at http://pub.dartlang.org. OS Error: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. , errno = 10060 
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Based on a discussion of comments, this problem is related to the fact that you are behind an HTTP proxy server. The Dart Editor and Dart Pub do not make any difference in the proxy server settings and only work if you have a normal Internet connection. It is currently written that the Dart team hopes to fix it at some point, but they are not there yet.

Please see more detailed information about this problem on errors and mark errors if you want it to be fixed.

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