Index: sources/gui/qml/pages/settings/SettingsDeviceRegistration.qml
===================================================================
diff -u -r45968308d0ad5074e17343e0e0f0a8c5a6c456d5 -rc2f474ff07c98aa350c445a2474976a3cf985f40
--- sources/gui/qml/pages/settings/SettingsDeviceRegistration.qml	(.../SettingsDeviceRegistration.qml)	(revision 45968308d0ad5074e17343e0e0f0a8c5a6c456d5)
+++ sources/gui/qml/pages/settings/SettingsDeviceRegistration.qml	(.../SettingsDeviceRegistration.qml)	(revision c2f474ff07c98aa350c445a2474976a3cf985f40)
@@ -14,7 +14,7 @@
  */
 
 // Qt
-import QtQuick
+import QtQuick 2.15
 
 // Project
 import Gui.Actions 0.1
@@ -47,6 +47,11 @@
     property var                ipValidator     : RegularExpressionValidator {
         regularExpression:/^(([01]?[0-9]?[0-9]|2([0-4][0-9]|5[0-5]))\.){3}([01]?[0-9]?[0-9]|2([0-4][0-9]|5[0-5]))$/
     }
+/* Qt6 Port: replace the above RegExpValidator with the following RegularExpressionValidator:
+    property var                ipValidator     : RegularExpressionValidator {
+        regularExpression:/^(([01]?[0-9]?[0-9]|2([0-4][0-9]|5[0-5]))\.){3}([01]?[0-9]?[0-9]|2([0-4][0-9]|5[0-5]))$/
+    }
+*/
 
     onVisibleChanged: {
         if ( visible ) vAdjustmentVersions     .doAdjustment()