From 1.3_01v1 to 1.3_01v2:
- Delete BlockPortalBlueBottom.class
- Delete BlockPortalBlueTop.class
- Delete BlockPortalBlueCeil.class
- Delete BlockPortalBlueFloor.class
- Delete BlockPortalOrangeBottom.class
- Delete BlockPortalOrangeTop.class
- Delete BlockPortalOrangeCeil.class
- Delete BlockPortalOrangeFloor.class
- Replace previous classes with new classes from download.