diff --git a/src/components/IFrame/IFrame.vue b/src/components/IFrame/IFrame.vue
index 8285613..75f3a0d 100644
--- a/src/components/IFrame/IFrame.vue
+++ b/src/components/IFrame/IFrame.vue
@@ -15,7 +15,9 @@ export default {
 
   beforeUpdate() {
     // freezing to prevent unnessessary Reactifiation of vNodes
-    this.iApp.children = Object.freeze(this.$slots.default)
+    if (this.iApp) {
+      this.iApp.children = Object.freeze(this.$slots.default)
+    }
   },
   methods: {
     getContentWindow() {
@@ -63,7 +65,9 @@ export default {
       const el = document.createElement('DIV') // we will mount or nested app to this element
       body.appendChild(el)
 
-      const iApp = new Vue({
+      const Constructor = Vue || window.Vue
+
+      const iApp = new Constructor({
         name: 'iApp',
         // freezing to prevent unnessessary Reactifiation of vNodes
         data: { children: Object.freeze(children) },
diff --git a/src/components/Viewer/Viewer.vue b/src/components/Viewer/Viewer.vue
index 76366f0..70c8f37 100644
--- a/src/components/Viewer/Viewer.vue
+++ b/src/components/Viewer/Viewer.vue
@@ -64,7 +64,7 @@
 </template>
 
 <script>
-import { version } from 'vue'
+import * as Vue from 'vue'
 import * as PDF from 'pdfjs-dist/es5/build/pdf.js'
 import PDFWorker from 'pdfjs-dist/es5/build/pdf.worker.js'
 import IFrameV3 from '../IFrame/IFrameV3'
@@ -78,7 +78,11 @@ import rotateWrapperStyle from '!!css-loader!!sass-loader!../RotateWrapper/Rotat
 /**
  * vue version > 3.0 has version property
  */
-const VUE_VERSION = Number((version || '2.6').split('.')[0])
+const version =
+  (Vue && (Vue.defalut ? Vue.defalut.version : Vue.version)) ||
+  (window.Vue && window.Vue.version) ||
+  '2.x'
+const VUE_VERSION = Number(version.split('.')[0])
 PDF.GlobalWorkerOptions.workerPort = new PDFWorker()
 
 const MARGIN_OFFSET = 20
diff --git a/src/components/ViewerPageSelector.vue b/src/components/ViewerPageSelector.vue
index af86dfd..60ae77d 100644
--- a/src/components/ViewerPageSelector.vue
+++ b/src/components/ViewerPageSelector.vue
@@ -258,6 +258,7 @@ export default {
       overflow: hidden;
       text-overflow: ellipsis;
       white-space: nowrap;
+      text-align: left;
     }
     .catalog-icon {
       > svg {