The interpretation of the steps of how to solve this program was a little tricky for me because in my case following the prompts at face value didn´t work, so I started to play with the columns of the database until something worked out. AND IT DID!
As follows I gather the steps I followed (worked at least in Windows 10):
Go to C:\Users\[your name]\AppData\Roaming\GMATPrep\Local Store\
Open the field "preptool.db" (in my case it was called "db" instead of "vd" as same people put it).
With a software called "SQLite Database Browser 2.0" (you can use any other with the same functionality) open the field.
Go to "Browse Data" (tab in the upper-left corner).
In table choose "exam_session" (upper-left part of the screen).
In status, change it to 1 just doing doble-click an inserting the value.
Exit and save changes.
Advice: Do all this process with the GMATPrep Software closed to avoid undesirable mishaps.
Afterwards you should be able to resume your exam and finish the uncompleted sections in order to get your coveted scored.
I hope that this spares some headaches!