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Opening an earlier version PREL in a later version is always iffy, at best, and often entirely impossible. Features come and go, and often their use can create issues. It is always best to finish Projects in the version, in which they were started.
Sorry for the bad news,
Thank you for the help!
The trick is to Archive the project in PRE 7 and then open it in PRE 9. To do this, you should go to File>Project Archiver and follow the steps.
Once it is done, just open the archived project in PRE 9
I still recommend against it. You almost almost get buggy behavior when you open an older version project in a newer version of the program.
Well, I've tried it in the past and it has worked for me, so its still worth a try.
If you do, then, I recommend you save a copy of your original version 7 project and don't save over it.
You may need to go back to it in version 7. Better safe than sorry.