installing a new Version like 7.0 or 7.1 is only possible if you have a license file for this version.
Normally you should pay a yearly maintenance and support contract which allows you to request a new license file from your DocuWare Partner (or DocuWare themselves if you are a direct customer).
Without this license file the setup will not continue.
Hope this helps.
Greetings from Germany,
Simon H. Hellmann
DocuWare System Consultant