Page Comparison

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1. 1. Revit 2019:
      HKEY_CLASSES_ROOT\Installer\Products\0A4B643700910150000007C5D0680240
      HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Products\0A4B643700910150000007C5D0680240
      
      Revit 2018:
      HKEY_CLASSES_ROOT\Installer\Products\0A4B643700710150000007C5D0680240

      Revit 2017:
      HKEY_CLASSES_ROOT\Installer\Products\0A4B643700710150000007C5D0680240
      
      Revit 2016:
      HKEY_CLASSES_ROOT\Installer\Products\0A4B643700510150000007C5D0680240

      AutoCAD 2016:
      HKEY_CLASSES_ROOT\Installer\Products\7D2F3875100F0000102000060BECB6AB

      
      Revit 2015:

      HKEY_CLASSES_ROOT\Installer\Products\0A4B643700410150000007C5D0680240

      HKEY_CLASSES_ROOT\Installer\Products\0A4B643700411150409007C5D0680240

      HKEY_CURRENT_USER\Software\Autodesk\Revit\2015

      HKEY_CURRENT_USER\Software\Autodesk\Revit\Autodesk Revit 2015

      HKEY_LOCAL_MACHINE\SOFTWARE\Autodesk\Revit\2015

      HKEY_LOCAL_MACHINE\SOFTWARE\Autodesk\Revit\Autodesk Revit 2015

      
      HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Products\0A4B643700410150000007C5D0680240
      HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Products\0A4B643700411150409007C5D0680240
      
      HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{7346B4A0-1400-0510-0000-705C0D862004}
      HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{7346B4A0-1400-0511-0409-705C0D862004}
      
      

2. Once you've deleted the keys above, close the Windows Registry Editor window, and reboot your computer.
3. Try reinstalling Revit 2020 / 2021 / 2022.
4. Additional Resources:
   1. 2021: How to Complete a Clean Uninstall of Revit Products
   2. How to Complete a Clean Uninstall of Revit Products
   3. Alternative Revit Uninstallation Instructions