Standard Assets (for Unity 2017.3) doesn't compile.

Importing the Standard Assets from the asset store no longer compiles. Is there an updated alternative? (or a fix?)

  AxisTouchButton.cs(3, 19): [CS0234] The type or namespace name 'EventSystems' does not exist in the namespace 'UnityEngine' (are you missing an assembly reference?)

  Joystick.cs(3, 19): [CS0234] The type or namespace name 'EventSystems' does not exist in the namespace 'UnityEngine' (are you missing an assembly reference?)

  TouchPad.cs(3, 19): [CS0234] The type or namespace name 'EventSystems' does not exist in the namespace 'UnityEngine' (are you missing an assembly reference?)

  TouchPad.cs(4, 19): [CS0234] The type or namespace name 'UI' does not exist in the namespace 'UnityEngine' (are you missing an assembly reference?)

  AlphaButtonClickMask.cs(2, 19): [CS0234] The type or namespace name 'UI' does not exist in the namespace 'UnityEngine' (are you missing an assembly reference?)

  EventSystemChecker.cs(4, 19): [CS0234] The type or namespace name 'EventSystems' does not exist in the namespace 'UnityEngine' (are you missing an assembly reference?)

  FPSCounter.cs(3, 19): [CS0234] The type or namespace name 'UI' does not exist in the namespace 'UnityEngine' (are you missing an assembly reference?)

  AxisTouchButton.cs(7, 48): [CS0246] The type or namespace name 'IPointerDownHandler' could not be found (are you missing a using directive or an assembly reference?)

  AxisTouchButton.cs(7, 69): [CS0246] The type or namespace name 'IPointerUpHandler' could not be found (are you missing a using directive or an assembly reference?)

  ForcedReset.cs(6, 27): [CS0619] 'GUITexture' is obsolete: 'GUITexture has been removed. Use UI.Image instead.'

  AxisTouchButton.cs(59, 29): [CS0246] The type or namespace name 'PointerEventData' could not be found (are you missing a using directive or an assembly reference?)

  AlphaButtonClickMask.cs(7, 15): [CS0246] The type or namespace name 'Image' could not be found (are you missing a using directive or an assembly reference?)

  AxisTouchButton.cs(70, 27): [CS0246] The type or namespace name 'PointerEventData' could not be found (are you missing a using directive or an assembly reference?)

  Joystick.cs(7, 41): [CS0246] The type or namespace name 'IPointerDownHandler' could not be found (are you missing a using directive or an assembly reference?)

  Joystick.cs(7, 62): [CS0246] The type or namespace name 'IPointerUpHandler' could not be found (are you missing a using directive or an assembly reference?)

  Joystick.cs(7, 81): [CS0246] The type or namespace name 'IDragHandler' could not be found (are you missing a using directive or an assembly reference?)

  Joystick.cs(74, 22): [CS0246] The type or namespace name 'PointerEventData' could not be found (are you missing a using directive or an assembly reference?)

  Joystick.cs(96, 27): [CS0246] The type or namespace name 'PointerEventData' could not be found (are you missing a using directive or an assembly reference?)

  Joystick.cs(103, 29): [CS0246] The type or namespace name 'PointerEventData' could not be found (are you missing a using directive or an assembly reference?)

  FPSCounter.cs(7, 31): [CS0246] The type or namespace name 'Text' could not be found (are you missing a using directive or an assembly reference?)

  FPSCounter.cs(15, 17): [CS0246] The type or namespace name 'Text' could not be found (are you missing a using directive or an assembly reference?)

  SimpleActivatorMenu.cs(10, 16): [CS0619] 'GUIText' is obsolete: 'GUIText has been removed. Use UI.Text instead.'

  TouchPad.cs(9, 41): [CS0246] The type or namespace name 'IPointerDownHandler' could not be found (are you missing a using directive or an assembly reference?)

  TouchPad.cs(9, 62): [CS0246] The type or namespace name 'IPointerUpHandler' could not be found (are you missing a using directive or an assembly reference?)

  TouchPad.cs(8, 27): [CS0246] The type or namespace name 'Image' could not be found (are you missing a using directive or an assembly reference?)

  TouchPad.cs(101, 29): [CS0246] The type or namespace name 'PointerEventData' could not be found (are you missing a using directive or an assembly reference?)

  TouchPad.cs(140, 27): [CS0246] The type or namespace name 'PointerEventData' could not be found (are you missing a using directive or an assembly reference?)

 

Try To Change "GUITexture" to "Image"