Purchasing license w sketchucation promo

hi there folks.
i am wanting to upgrade to pro, and have seen an offer from sketchucation (20% off for premium members) and am wondering if anybody knows about this(still valid???) also sketchucation offers the premium membership and premium+ ,is the premium+ an upgrade to the premium?? little confused…

Difference between SketchUcation Premium and Premuim +: Free shop account (more details: SketchUcation • Signup )

There is/was a offer for Premium members (SketchUp Premium Discount | SketchUcation ), but you should perhaps ask at SketchUcation about the actual status…