OK. Again, those directions were written for Desktop Manager 5.
Yes, Apply is what you needed to click (I had already closed the Desktop Software when I typed the response above with "finish or next", Sorry).
In Desktop Software v6, go to Device > Restore, and you will navigate to and find the specific IPD file you've downloaded with the Tmobile Service books.
I'm here for right now if you have more questions. The problem is my laptop at home I've specifically kept DMv5 on it instead of upgrading to the Desktop Software v6
So I may be doing some of this memory. I'll do my best to remember!