System:
CiviCRM 6.2.0
SEPA Civi 1.11.0 (latest available version at the time of writing)
OS: Ubuntu 20.04 with PHP 8.1, MariaDB 10.6.21
I already had to patch the extension because of patch #751 Now, in the patched extension, when I view a contact, click on SEPA mandates, view the mandate I see the following error, indicating that the templates for SEPA pre-notification are absent:

When I click the button I see
tpl (value: undefined) is not of the type Positive
And indeed, under Administer/Communication/Message templates, there is no SEPA pre-notification template.
I installed the extension just a few days ago on a fresh CiviCRM 6.2.0 install.