Hi,
Sorry for the issues with SiteGround and the unsubscribe links on alerts.
You are talking about the alerts being sent setup from this page:
Events > Settings > Community Tab > Alerts Section
Correct?
If so if you follow our themers guide:
To move to your theme and then edit this file:
the-events-calendar-community-events/views/community/email-template.php
You can add the unsubscribe link the way you would like before the closing body tag as html without having to use php.
Let me know if you have any follow up questions.
Thanks