[Solved] iTunes error: C:\Config.Msi\6aedf9.rbf

Problem:

During iTunes install/ update, sometimes you get an error writing to file config.msi such as C:\Config.Msi\6aedf9.rbf

Solution:

Go to My Computer.
On the menu bar -
Organize> Folder and search options>
In the View tab -
uncheck - Hide protected operating system files (Recommended)

Now you will be able see Config.Msi folder in Computer> Local Disk (C:).

Opening it will grant you the permission to access it.

Now you can continue with the install/ update of iTunes and just click on retry each time the above error occurs.

After the installation is done make sure you check 'Hide protected operating system files (recommended) again.