Fix downloadPresenter and initial LicensePresenter.py code

CURA-6983

plugins/Toolbox/src/CloudSync/LicenseModel.py

@@ -0,0 +1,30 @@
+from PyQt5.QtCore import QObject, pyqtProperty, pyqtSignal
+
+
+# Model for the ToolboxLicenseDialog
+class LicenseModel(QObject):
+    titleChanged = pyqtSignal()
+    licenseTextChanged = pyqtSignal()
+
+    def __init__(self, title: str = "", license_text: str = ""):
+        super().__init__()
+        self._title = title
+        self._license_text = license_text
+
+    @pyqtProperty(str, notify=titleChanged)
+    def title(self) -> str:
+        return self._title
+
+    def setTitle(self, title: str) -> None:
+        if self._title != title:
+            self._title = title
+            self.titleChanged.emit()
+
+    @pyqtProperty(str, notify=licenseTextChanged)
+    def licenseText(self) -> str:
+        return self._license_text
+
+    def setLicenseText(self, license_text: str) -> None:
+        if self._license_text != license_text:
+            self._license_text = license_text
+            self.licenseTextChanged.emit()