NPrinting connections to QlikView result in Incompatible Desktop error message

[Daniele_Purrone]

After downgrading QV server and QV desktop to a previous backup (ie: QV 12.5 to QV 12.4) you may see the following error when running NPrinting Connection Verification Button:

• x - "QlikView Server version is compatible with installed QlikView Desktop"

Yet, the QV server is running the downgraded version - ie: April 2020 SR4 and the NP server (or NP engine computer if the NP Engine is installed on a different computer than the NP server) has the same desktop version installed ie: April 2020 SR4. 

Environment

• Qlik NPrinting  June 2020 SR1 or higher

Resolution

You may resolve this by the following steps:

Diagnosis: On the NPrinting server where the QlikView desktop is installed,

• Navigate to

"C:\Program Files\QlikView\QvProtocol"

• Right Click on the file QVP.dll
• Open the 'Details' tab to view the QVP.dll properties to verify the version of QlikView
• The properties will show that the QV desktop is different than the QV server.

Next Actions

Delete the file QVP.dll and run a repair of the QV desktop
or
To ensure a clean reinstall:

• Remove the QV desktop entirely by uninstalling it from Programs and Features in the Windows Control Panel
• Delete the following folders on your NP server

"C:\Program Files\QlikView\"
"C:\Users\NPServiceUserProfile\AppData\Roaming\QlikTech\QlikView"

• Launch Regedit.msc (NOTE: editing Windows's registry it's done at one's own risk) and
  • take a backup of the current Registry (File --> Export --> Export Range: all)
  • search of any reference of qv.exe (Edit --> Find)
  • right click on the result and Delete
  • search for the next instance of qv.exe (Edit --> Find Next) and repeat until completed
• Reinstall the QV desktop (ensure it is the same version as the QV server. Re-run the diagnosis to verify the correct version of the QVP.dll)
• If you haven't already done so, log on as the NP service account to the NP server computer
• Do 'file>open in server' to retrieve/download the manually assigned Named CAL from the QlikView server to the QlikView Desktop

Cause:

What causes this?

• In rare instances, the QVP.dll file is not removed when downgrading the QV desktop.