diff --git a/launcher/ui/pages/modplatform/ResourcePage.cpp b/launcher/ui/pages/modplatform/ResourcePage.cpp
index 407684f8b..1f2261e2c 100644
--- a/launcher/ui/pages/modplatform/ResourcePage.cpp
+++ b/launcher/ui/pages/modplatform/ResourcePage.cpp
@@ -418,7 +418,14 @@ void ResourcePage::onToggle(const QModelIndex& index)
                 return m_model->checkVersionFilters(version);
             });
 
-            if (version != pack->versions.end())
+            if (version == pack->versions.end()) {
+                auto errorMessage = new QMessageBox(
+                    QMessageBox::Warning, tr("No versions available"),
+                    tr("No versions for '%1' are available.\nThe author likely blocked third-party launchers.").arg(pack->name),
+                    QMessageBox::Ok, this);
+
+                errorMessage->open();
+            } else
                 addResourceToDialog(pack, *version);
         }