Installing Copernic Desktop fails with error

I'm attempting to install Copernic Desktop Search on Windows 10. I get a message:

"An error occurred during installation of assembly 'Microsoft.VT90.CRT,version="9.0.30729.6161",publicKeyToken="1fc8b3b9a1e18e3b",processorArchitecture="amd64",type="win32"'. Please refer to Help and Support for more information. HRESULT: 0x80070002"

The installer then reports that it has ended prematurely.

Copernic Support informed me that the computer's NET framework needed repairing, but running Microsoft's NET Repair Tool has had no effect.

Can anyone suggest a course of actio that might resolve this problem?