Missing CcOptin file

3 days ago I have upgraded to Concrete5 from a previous version and after that I've got this message: "Class 'Concrete\Package\CcOptinFree\CcOptin' not found" and we are not able to reach our homepage anymore. (http://ceoptics.hu/concrete/ )
How could I solve this problem?
Thanks in advance,

View Replies:
MrKDilkington replied on at Permalink Reply
Hi ceop,

The developer has released a fix that requires updating the add-on to version 0.9.17.

The developer lists this as the solution for removing the add-on to access the site.
ceop replied on at Permalink Reply
Of course we red these advices, but unfortunately didn't work at our pages. I think Opt-In cause the problem. How should I delete this add-on?
After we deleted CcOptin.php didn't change anything. We got previous note:
An unexpected error occurred.
Class 'Concrete\Package\CcOptinFree\CcOptin' not found

If I delete the whole CcOptin folder I receive this message:
Symfony\Component\ClassLoader\MapClassLoader::loadClass(): Failed opening required '/home/m234761/public_html/concrete/packages/cc_optin_free/controller.php' (include_path='/home/m234761/public_html/concrete/concrete/vendor:.:/usr/lib/php:/usr/local/lib/php')
Any other idea?