SolidWorks Install Error: Windows Installer “RollbackUnReg” — Fix

When installing SolidWorks you may run into the error “Windows Installer for this product component did not work as expected: RollbackUnReg”.

The installation aborts and rolls back.

Restarting the installation ends with the same error.

What fixed it

Uninstall all Microsoft Visual C++ Redistributable packages (2008, 2012 and the rest) the standard way: Start → Control Panel → Programs → Uninstall a program. Then start the SolidWorks installation again.

SolidWorks installs the Visual C++ versions it needs by itself, and the installation should complete successfully.

Note: other programs may also use those Visual C++ packages. If something stops working after SolidWorks is installed, reinstall the latest Visual C++ Redistributable from Microsoft.

P.S. Running the installer as administrator didn’t help, and neither did registry cleaners or various “doctor” utilities.