Upgrade Enfold 4.5.2 – Fatal Error – Class 'av_privacy_class' not found line 879

I had the following problem when upgrading from Enfold 4.4.1 to Enfold 4.5.2 in December 2018
Fatal error Class ‘av_privacy_class’ not found in enfold/includes/admin/register-admin-options.php on line 879
Here is the cause of the problem:
The Class ‘av_privacy_class’ is defined in the file enfold/includes/helper-privacy.php but there is no line of code referring to it in the file enfold/includes/admin/register-admin-options.php
Here is a solution:
1-Add this Line of php code (I added it on line 48) in the file enfold/includes/admin/register-admin-options.php: include(‘helper-privacy.php’);
2-Copy the file enfold/includes/helper-privacy.php to this directory enfold/includes/admin/
Hope it can help
Cheers