Same problem. I get the "Add Store Error" -- NOT the longer error message that is in the Flash tutorial. I checked the remote laptop and can edit, rename the other .pst file, etc. Am using the trial version (although I have paid for and am still waiting for my registration key!)
Received my registration key (thank you Max), but still have the "Add Store File" error. Again, I can find the remote .pst file remotely and rename it, without problems, so referring me to the flash tutorial isn't the answer.