Quiz created in older version of quizmaker cant be opened

Got a file from a client (se attachement) that is created in an older version of quizmaker.
When i trying to open it in quizmaker 13 i am prompted "This quiz is from an earlier version of Quizmaker. Would you like to convert it now? A backup will be created of the original fle".

I then press yes. BUT when i do, my Quizmaker 13 crashes.

Could someone explain why and how to solve the problem?

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