We are changing hotfix download procedure. It is not finished by we are on the way.

So you can try to download NAV hotfix if you know Kb article for bug you want to correct.
For example:

1. You know you need fix for KB article 961430 - The filter values are not populated automatically into the page fields as expected in the Microsoft Dynamics NAV 2009 RTC client.
2. You go to https://mbs.microsoft.com/knowledgebase/search.aspx and search for KB article.
3. You got link to KB article https://mbs.microsoft.com/knowledgebase/KBDisplay.aspx?WTNTZSMNWUKNTMMYSZRRNOTTUKOOSTLLTRLKPPTYWTYUNZOUTRWWRTKOLTWNKYSZ
4. In the upper left corner is link to "View and request hotfix download". It opens http://support.microsoft.com/hotfix/KBHotfix.aspx?kbnum=961430&kbln=en-us
5. You enter your email and confirm picture and receive email to download fix.

One more trick: if you know KB article No# you can add it directly to link http://support.microsoft.com/hotfix/KBHotfix.aspx?kbnum=968411&kbln=en-us and you can download fix.