I know this is an old thread but hopefully it helps someone. I went to the website and downloaded the version I was transferring first.  Ran the installer and then cancelled when it wanted my SN. Migration tool then worked. 

1.  Go here and download/install the version you are moving https://downloads.quickbooks.com/app/qbdt/products

2. Cancel when it wants your S/N and code 

3. Run migrator tool