Issue:

Example:

When attempting to install Revit 2021, the following message appears:


Autodesk Revit 2021 is already installed.


Depending on the installation media used, the following Install Wizard is presented:
 

Causes:

  • Remnant files from a previous installation.

Solution:

Run the Uninstall tool and Reinstall Revit

  1. Run the AdskUninstallHelper tool found in C:\ProgramData\Autodesk\Uninstallers\Autodesk Revit 202x.
  2. Retry the Revit 2021+ installation.


Clear the registry from Revit 2021 key

  1. Open the Windows Registry (Start > type regedit > press ENTER).
  2. Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\.
  3. Find the key {7346B4A0-2100-0510-0000-705C0D862004}.
  4. Right-click on it and select "Rename".
  5. Append .old at the end of the key. It should be eventually: {7346B4A0-2100-0510-0000-705C0D862004}.old.
  6. Retry the Revit 2021 installation.

Clear the registry from Revit 2022 key

  1. Open the Windows Registry (Start > type regedit > press ENTER).
  2. Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\.
  3. Find the key {7346B4A0-2100-0510-0000-705C0D862004}.
  4. Right-click on it and select "Rename".
  5. Append .old at the end of the key. It should be eventually: {7346B4A0-2200-0510-0000-705C0D862004}.old.
  6. Retry the Revit 2022 installation.

Warning!

Problems caused by improperly editing the Windows registry could render your computer operating system unusable. Microsoft provides a wealth of critical information that you need to know about the registry in the Microsoft Knowledge Base. Use the Microsoft Registry Editor only at your own risk and only after backing up the registry as outlined for your operating system in the Microsoft article How to back up and restore the registry in Windows and in the related solution How to back up the system registry. Additional information about the registry is also contained in the Help topics in the Microsoft Registry Editor.


Clean up remnants from previous install attempts

  1. Download Microsoft Uninstall Troubleshooter
  2. Launch it and select Next > Uninstalling.
  3. In the program list, select Not Listed.
  4. Paste the following value in the Product Code box: {7346B4A0-2100-0510-0000-705C0D862004}.
  1. Click Next. Wait until the process is completed.
  2. Retry the Revit 2021+ installation.


Reinstall Microsoft Visual C++ Runtime Libraries

  1. Follow the steps in the article How to remove and reinstall Microsoft Visual C++ Runtime Libraries
  2. Retry the Revit 2021+ installation using the Browser Download installation method.