It is not possible to upgrade directly from vRanger 4.x to vRanger 6.x.
The following procedure needs to be followed: https://support.quest.com/technical-documents/DOC103186
1) Upgrade firstly to vRanger 5.5
2) Once you have successfully upgraded to vRanger 5.5, you must acquire your new license key which is necessary when upgrading to version 6.x
Please see the following information regarding obtaining your new license key: https://support.quest.com/technical-documents/DOC103185
3) Once you have received your new license key, you can proceed to upgrade to vRanger 6.x
