How to download WWDC 2011 session_310__whats_new_in_instruments
I try to inspect the html element 

&lt;a href="https://developer.apple.com/devcenter/download.action?path=/videos/wwdc_2011__hd/session_310__whats_new_in_instruments.m4v"
onclick="s_objectID=&amp;quot;
https://developer.apple.com/devcenter/download.action?path=/videos/wwdc_2011__hd/session_310__wha_1&amp;quot;
;return this.s_oc?this.s_oc(e):true"&gt;

HD Video&lt;/a&gt;


and fint the HD resource is demaged . So I downloaded the SD m4v.