One click update does't work in wordpress

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hello to all,

I have a site with wordpress 3.8 and now I want to update this in 3.8.1, one click update not working in my wordpress 3.8 installation.

This message appears when I click on update button:
Update WordPress
Downloading update from https://www.ads-software.com/wordpress-3.8.1-no-content.zip
Download failed.: couldn’t connect to host

Installation Failed

Please suggest me what is the problem I don’t want update wordpress manually.

Thanks
Mukesh