When I upgraded from Unity 2017 to 2019, an error occurred and I could not play.
It seems that the old editor is deprecated and the script does not work.
The editor I used was MonoDevelop.

Was the new editor good for Visual Studio? Is UI.Text instead Visual Studio?
The Script in this game can no longer be opened, so it seems that it needs to be replaced.
please tell me. Please.

Error display ↓
Assets\Standard Assets\Utility\SimpleActivatorMenu.cs(11,16): error CS0619:'GUIText' is obsolete:'GUIText has been removed.Use UI.Text instead.'

The following is the translation.
Assets \ Standard Assets \ Utility \ SimpleActivatorMenu.cs (11,16): Error CS0619:'GUIText' has been deprecated:'GUIText has been removed. Use UI.Text instead.