diff --git a/src/slic3r/GUI/GUI_App.cpp b/src/slic3r/GUI/GUI_App.cpp
index 093881b021..8d3bea1a6d 100644
--- a/src/slic3r/GUI/GUI_App.cpp
+++ b/src/slic3r/GUI/GUI_App.cpp
@@ -940,6 +940,33 @@ void GUI_App::post_init()
         });
     }
 
+    // Orca: notify users upgrading from a pre-2.4.0 version that profile syncing
+    // moved from Bambu Cloud to Orca Cloud.
+    if (is_editor() && m_last_config_version && m_last_config_version->valid()
+        && *m_last_config_version < Semver(2, 4, 0)) {
+        CallAfter([] {
+            const wxString wiki_url = "https://www.orcaslicer.com/wiki/user_profiles/user_profiles.html#profiles-missing-after-updating-from-bambu-cloud";
+            MessageDialog dlg(nullptr,
+                _L("Since version 2.4.0, OrcaSlicer syncs user profiles through Orca Cloud instead of Bambu Cloud.\n\n"
+                   "To migrate your existing profiles, log in to Orca Cloud and they will be transferred automatically. "
+                   "If any profiles are still missing afterwards, follow the guide in our wiki to restore them.\n\n"
+                   "If you did not use Bambu Cloud to sync profiles, this change does not affect you and you can safely ignore this message."),
+                _L("Profile syncing change"),
+                wxOK,
+                "",
+                _L("Learn more"),
+                [wiki_url](const wxString &) { wxLaunchDefaultBrowser(wiki_url); });
+            // Hack: the "Learn more" link renders the message in a wxHtmlWindow whose
+            // height is underestimated for multi-paragraph text, leaving a scrollbar.
+            // The html sits in a proportion-1 sizer chain, so grow the dialog (never
+            // shrink it below its content width) to give the text enough room.
+            const wxSize sz = dlg.GetSize();
+            dlg.SetSize(std::max(sz.x, dlg.FromDIP(280)), std::max(sz.y, dlg.FromDIP(200)));
+            dlg.CenterOnParent();
+            dlg.ShowModal();
+        });
+    }
+
     if(!m_networking_need_update && m_agent) {
         m_agent->set_on_ssdp_msg_fn(
             [this](std::string json_str) {
@@ -2772,8 +2799,9 @@ bool GUI_App::on_init_inner()
         }
     }
 
-    if(app_config->get("version") != SLIC3R_VERSION) {
-        app_config->set("version", SLIC3R_VERSION);
+    //Orca: write OrcaSlicer version
+    if(app_config->get("version") != SoftFever_VERSION) {
+        app_config->set("version", SoftFever_VERSION);
     }
 
     // Orca: use wxWeakRef to provent wild pointer.