Today, 1/2/16 in Hong Kong, I have exactly the same problem as DAVID on 29/1 — which you said you FIXED!
Quote: When I click on “click here to go to the SharewareOnSale exclusive registration page” in the email, the page says: “Invalid register of product”
Can you please “fix” it again?
Actually, this is not the first time I have seen this error message — last week I just gave up.
I do think you might want to make that a slightly more permanent fix….