Because Visual Basic 6.0 is long out of mainstream support, finding the official installer requires looking for the update package.
Visual Basic 6.0 Service Pack 6 Redistributable microsoft windows common controls-2 6.0 -sp6- download
Once you have the legitimate MSCOMCT2.OCX file, simply placing it in a folder is not enough. Windows requires the file to be "Registered" in the Because Visual Basic 6