403 Forbidden error for "Collect In Store Checkout Shipping Option"

Request your help to sort following error.

I am trying hands on on “Collect In Store Checkout Shipping Option”.

While I am trying to install extension with steps mentioned ahead I get error mentioned below

REDIRECTED URL: http://connect20.magentocommerce.com/community/Pook_CollectInStore/

ERROR:

Forbidden You don’t have permission to access url on this server. Apache/2.2.3 (CentOS) Server at connect20.magentocommerce.com Port 80

Steps:

1. Accessed following EXTENSION PAGE URL http://www.magentocommerce.com/magento-connect/collect-in-store-checkout-shipping-option.html
2. Ticked check box : I agree to the extension license agreement.
3. Clicked button : Get Extension Key
4. This showed text box with URL
5. Clicked Select Key to select URL, copied it and pasted to new browser window. Hit Run / enter to browse URL
6. Page gave ERROR : 403 Forbidden You don’t have permission to access url on this server.