I thought I could access them through "My Stuff" but they no longer show up there. The products I purchased in the last couple of months are: Permaculture Adventure Bundle ($35), Gardener Master Course ($35), and Permaculture Design Course plus the Appropriate Technology Course ($49.50).
It is true - I don't see those things attached to your account.
My first thought is that you bought it with an email address that is different than the email address tied to this account.