Sometimes you find bugs and need to troubleshoot a little bit the situation.

Precisely what happened to me when upgrading from VCSA 6.0 to VCSA 6.5 with embedded VMware Update Manager (VUM).

It took me a little digging here and there and few messages to my colleagues in the VMware community, but finally I came up with the solution.

Error attempting Vcintegrity Export file does not exist or is corrupted, abort import.

The migration assistant wont help because the process is expecting to find the service in the old vCenter appliance (VCSA 6.0).

This is a documented problem, and youll see the KB here.

The first step is to remove the VUM from the old server, then deregister the Web Plugin from the new vCenter.

At this moment go ahead and restart(stop and start) the web client service in the VCSA command line.

And then either disable the VMware Update Manager plugin from the web client using the GUI or the MOB, these are the steps.

Where vCenterServernameorIPmob is the name of your vCenter Server or its IP address.

For a list of default plug-ins, see the Additional Information section of this article.

Following your guide I was able to re-register VUM to vCSA in 6.7.

Vsphere 5.5 Check New Notifications Queued