While installing revit 2013 i lost internet and once it finished installing it told me it could not download certain things so i tried to repair/reinstall it but it will not let me repair, uninstal, open, or repair it. I just want to start the installation over again!
After the Fixit Utility I would download the installation files as a “Browser” method of download. I would consider your existing files as problematic. After you download the files completely, then install.
Turn off Windows UAC, Antivirus, and log in as an Admin.