This question was posted in response to the following article: http://helpx.adobe.com/indesign/release-note/indesign-cs6-1-release-notes.html
After all this page's bumf about the download, why isn't there a link on this page to actually start the download?
Installation is done using the Adobe Application Manager, not by downloading anything using your web browser. You can update InDesign by going to Help > Updates…. This will open up the Application Manager, and install any updates that are available.