NOTE! Methods of subscribing from public section were changed. New scripts for public section placed in /bitrix/modules/subscribe/public/:
•subscr_edit.php - to add and edit subsription address;
•subscribe.php - subscription rubrics list with desriptions;
•subscr_form.php - subscription form with configurable design.
Scripts should be either copied to public section of the site or included from the other public pages with require() function. It is necessary that script highlighted with bold should replace the old file.
After installing the update mail templates for confirming the subscription will also be modified. It's possible that these templates need to be edited.
After installing the update it's recommended to check the Subscription module settings (visit "System settings - Settings" menu)