If running 17.0 or 17.1 and there is a need for upgrading to NPrinting 17.3. However, in order to keep the Connections and Applications in the database and then restore them for a backup on the target version, if backed up in NPrinting 17.0 or 17.1 the restore will not work in 17.3. That is a limitation and it was described and clarified more under the following link: Upgrading Qlik NPrinting
** To upgrade to Qlik NPrinting June 2017 or newer you must start from any of the Qlik NPrinting 17.3 series.
Additional details regarding the correct upgrade path are as follows:
- NPrinting 17.0
- NPrinting 17.1
- NPrinting 17.1.2
- NPrinting 17.2.0
- NPrinting 17.2.3
At every step, the same upgrade procedures have to be executed. Back up the database. Stop the services. Run the installer.