The install of VSA 6.3 will not continue if Network Discovery v1.1 or earlier is installed on your VSA.
Network Discovery 1.2 is the only version of this module supported by VSA v6.3, and only if Network Discovery v1.2 was previously installed in VSA v6.2.
Before upgrading to VSA v6.3, ensure your VSA is either:
The Network Discovery 1.2 installer is located at: