I've experienced the same disappointment. I tried to train someone today, and it ended up being "Well, this is what should happen...." session.
Good news is that all the code can be reused in 8.70, but you'll need to recreate the Projects (and Suite) from scratch, then manually add the units. Really bad news is that the Namemapping file cannot be used anymore! Unless Smartbear has a backwards conversion program available, you'd have to build that from scratch.
There is a newer build (1312), but it didn't solve my slowness problem.
