def load_installed_version(self):
        installed_packages = get_installed_pypackages()
        if self.package in installed_packages:
            self.version = "=={}".format(
                installed_packages[self.package].version)
def draw(self, context):
        self.layout.operator("wm.appconfig_default", text="Blender (default)")

        # now draw the presets
        Menu.draw_preset(self, context)