You can see if PTC University will still sell you the old version of the course. It may be "at you own risk" since it's been been discontinued. But there is still lots of good information and foundation level lessons you can learn from in there.
The only other way is to read through the Online Help and some of the Customizers guides distributed with Arbortext.
I am looking into the feasablity of still purchasing this course, will let you know what I find out. As already mentioned, it has some good foundation information, regardless of what version of the product you may currently be on (although there are new calls and parameters that are introduced over the years).