I tried to find this file on my computer but it is missing... I have Revit 2014 - student version. This is the link from where I dowloaded the service pack http://usa.autodesk.com/adsk/servlet/...
But I can't find if I had installed the First Customer Ship build of Autodesk Revit 2014 (Build: 20130308_1515).
Welcome to the community. The update is looking for your original installation files. If you deleted it or did not save it, then you can redownload it again, or you can download the trial, or use Matt, the virtual assistant to get it.
Autodesk changed their support links. Hopefully I can get updated links as customers like you point them out. Thanks!
I would recommend that you try downloading your product using the virtual assistant by following the directions here: