downgrade from Custom Sidebar....

Hi,

I have done a downgrade from Custom sidebar for a customer because they donot need to use pro functions but also because it is a non profit co (church).
First I have deleted custom sidebars Pro using Filezilla.
Second copied files from custom sidebars Free, also using Filezilla.
So it was done and everything looked like ok.

Now I am gettin the message that I need to update and upgrade to the Pro version.

How can I get it done that customer only uses the Free vrsion and that no upgraded is asked?

Thanks!!!!!!