diff --git a/course/en/blocks.json b/course/en/blocks.json
index 46bea29..a8c9938 100644
--- a/course/en/blocks.json
+++ b/course/en/blocks.json
@@ -25498,7 +25498,7 @@
     "instruction": "",
     "_isOptional": false,
     "_isAvailable": true,
-    "_isHidden": false,
+    "_isHidden": true,
     "_isVisible": true,
     "_requireCompletionOf": -1,
     "_isA11yCompletionDescriptionEnabled": true,
@@ -25531,6 +25531,8 @@
         "_hasIcon": false,
         "text": "Continue",
         "ariaLabel": "Continue",
+        "disabledText": "",
+        "disabledAriaLabel": "Continue",
         "startText": "Begin",
         "startAriaLabel": "Begin",
         "finalText": "Finish",
diff --git a/course/en/components.json b/course/en/components.json
index 9ca18f8..1b6dd43 100644
--- a/course/en/components.json
+++ b/course/en/components.json
@@ -18096,7 +18096,7 @@
       "ogv": "",
       "webm": "",
       "mp3": "",
-      "source": "https://youtu.be/vVt0H35GM4A",
+      "source": "https://youtu.be/-mT3JjFKtwg",
       "type": "video/youtube",
       "poster": "",
       "cc": []
@@ -18133,9 +18133,9 @@
     "_isVisible": true,
     "_isResetOnRevisit": "false",
     "_isA11yCompletionDescriptionEnabled": true,
-    "title": "Lecture Recording: L01 - Part 1",
-    "displayTitle": "Lecture Recording: L01 - Part 1",
-    "body": "<p>Watch the lecture recording for lecture L01 - Introduction (Part 1).</p>",
+    "title": "Lecture Recording: L01 ",
+    "displayTitle": "Lecture Recording: L01 ",
+    "body": "<p>Watch the lecture recording for lecture L01 - Introduction.</p>",
     "_id": "66f62113f59def4b2c742465",
     "_parentId": "66f62113f59def4b2c742459",
     "_type": "component",
@@ -18172,7 +18172,7 @@
       "ogv": "",
       "webm": "",
       "mp3": "",
-      "source": "https://youtu.be/P371viv131g",
+      "source": "https://youtu.be/JlxNfXUhMOY",
       "type": "video/youtube",
       "poster": "",
       "cc": []
diff --git a/course/en/contentObjects.json b/course/en/contentObjects.json
index 3a0e73d..9b4b372 100644
--- a/course/en/contentObjects.json
+++ b/course/en/contentObjects.json
@@ -1210,7 +1210,7 @@
   {
     "title": "Lecture 01",
     "displayTitle": "Lecture 01",
-    "body": "<p>This lecture is about</p><ul><li>gaining an understanding of causes, dimensions, and the characterization of the three critical challenges of the 21st century, i.e.,<ul><li><em>climate change</em></li><li><em>environmental pollution</em></li><li><em>dwindling non-renewable resources</em></li></ul></li><li>carefully assessing available solutions</li></ul><p>Lecture recordings will be available <strong>the day after the live session on 30/10/2024</strong>.&nbsp;</p>",
+    "body": "<p>This lecture is about</p><ul><li>gaining an understanding of causes, dimensions, and the characterization of the three critical challenges of the 21st century, i.e.,<ul><li><em>climate change</em></li><li><em>environmental pollution</em></li><li><em>dwindling non-renewable resources</em></li></ul></li><li>carefully assessing available solutions</li></ul>",
     "_classes": "",
     "subtitle": "",
     "pageBody": "<p>In this lecture, you will discover the central concept behind the course. We will provide a brief overview of the ecological problems and societal challenges and discuss and explain why we believe this is more important to you than you may realize.</p><p>Below, find the lecture recording, the slides, and the exercise for this lecture. Lecture recordings will be available <strong>a day after the live session</strong>. Clicking on the links will take you to our publicly available teaching materials on GitHub.</p>",
@@ -1218,10 +1218,8 @@
     "_htmlClasses": "",
     "linkText": "View",
     "duration": "90 minutes",
-    "_lockedBy": [
-      "66f62112f59def4b2c742454"
-    ],
-    "_lockType": "custom",
+    "_lockedBy": [],
+    "_lockType": "",
     "_isOptional": false,
     "_isAvailable": true,
     "_isHidden": false,
@@ -4171,7 +4169,7 @@
     "linkText": "View",
     "duration": "90 minutes",
     "_lockedBy": [],
-    "_lockType": "custom",
+    "_lockType": "",
     "_isOptional": false,
     "_isAvailable": true,
     "_isHidden": false,