Nintex templates download as I was investigating some issue with their search bar. In the header file, if you have multiple '<input' (like we would normally do for language switcher options) it negates the button being clickable at all.

Custom_Templates/customer_templates/Nintex University/unsubscribe.html.liquid

@@ -0,0 +1,60 @@
+{% include "header"
+  , color: "var(--nintex--color--deep-purple)"
+  , text_color: "white"
+  , text_en_US: ""
+  , text_es: ""
+  , text_fr: ""
+  , text_de: ""
+  , text_en_GB: ""
+  , text_nl: ""
+  , text_pt_BR: ""
+  , subtitle_en_US: ""
+  , subtitle_es: ""
+  , subtitle_fr: ""
+  , subtitle_de: ""
+  , subtitle_en_GB: ""
+  , subtitle_nl: ""
+  , subtitle_pt_BR: ""
+  , button_text_en_US: ""
+  , button_text_es: ""
+  , button_text_fr: ""
+  , button_text_de: ""
+  , button_text_en_GB: ""
+  , button_text_nl: ""
+  , button_text_pt_BR: ""
+  , button_link: "" %}
+<main class="np-main np-cta-page np-max-width np-subpage-container">
+  <div class="np-card-container np-card-padding-xlarge">
+    {% if token %}
+      <i class="np-cta-page-icon fal fa-bell-slash"></i>
+      <div class="np-form-subheadline np-margin-top">
+        {% t.unsubscribe_text %}
+      </div>
+      <div class="np-form-subheadline np-margin-top">
+        {% t.resubscribe_text %}
+      </div>
+      <form
+        id="unsubscribe_form"
+        action="{% route email_unsubscribe, unsubscribe_token: token %}"
+        method="post"
+        class="np-cta-page-buttons">
+        {% form_authenticity_token %}
+        <input
+          type="hidden"
+          name="_method"
+          value="delete">
+        <input
+          type="submit"
+          name="commit"
+          value="{% t .resubscribe_button %}"
+          class="np-button np-button-wide">
+      </form>
+    {% else %}
+      <i class="np-cta-page-icon fal fa-bell-on"></i>
+      <div class="np-form-subheadline np-margin-top">
+        {% t.resubscribed_text %}
+      </div>
+    {% endif %}
+  </div>
+</main>
+{% include "footer" %}