Add FAQ

Author: pierotofy

templates/download.html

@@ -426,6 +426,16 @@ <h3 style="margin: 0 0 0.5rem; font-size: 1.05rem; font-weight: 700; color: #5b2
     <h2 class="faq-heading mb-4">Frequently Asked Questions</h2>
 
     <div class="faq-list">
+      <details class="faq-item">
+        <summary class="faq-question">
+          <span>I previously purchased an installer. Can I just install the new one to update?</span>
+          <svg class="faq-chevron" width="20" height="20" viewBox="0 0 20 20" fill="none"><path d="M5 7.5L10 12.5L15 7.5" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/></svg>
+        </summary>
+        <div class="faq-answer">
+          <p>Yes, you should be able to run the new installer over the previous installation folder and your projects and tasks will migrate automatically. To be safe, make a backup of the previous WebODM installation folder before running the new installer.</p>
+        </div>
+      </details>
+
       <details class="faq-item">
         <summary class="faq-question">
           <span>Can WebODM process my dataset?</span>