Missing interface files in 5.6.0.2

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Hi,

I have recently upgraded all our sites to 5.6.02, and i'm getting several recurring errors showing up.

Using our account titania as an example, the error reports that the script is looking for
a file:
/home/titania/public_html/updates/concrete5.6.0.2/concrete/helpers/concrete_interface.php
which is being called from:
/home/titania/public_html/updates/concrete5.6.0.2/concrete/core/libraries/loader.php.
I verified the concrete_interface.php file is missing in all our installs and in a fresh download of concrete?

This missing concrete_interface.php seems to be very common across the errors that I see.

Can anyone please shed some light? Thanks

BHWW