NO! You can open your old file and use the "compare" feature to compare your old file to the new one you downloaded. Then go through and set everything back to whatever stock is. There is a compare summary feature that will show you what is different, line by line...
You did not need to use any licenses for this, but I'm glad to see it worked at least
If you want to open the file you downloaded, just hit no thanks when it asks about licensing. You can still open it and view it, but just cannot save/write it.
The compare feature is really what you should have used though. Just open the "old" file, then go to compare-->open compare file. Then open the "new" one you downloaded from the repository.
From there you can show the "main" file, "compare" file, or, the delta between the two.
I would set it to show the deltas, then just go through and set everything to zero. Save as a new file.. and write. No licenses needed.