Here are the links to download MapGuide 6.5 Service Pack 1 (for now):
MapGuide Dynamic Authoring Toolkit 6.5
MapGuide Component Toolkit 6.5
Use at own risk as these products are no longer supported! I have been continuing to consult with people to help move them to Autodesk Infrastructure Map Server 2014 or MapGuide Open Source – let me know if you need help migrating.