I ran into a couple minor issues upgrading to the new VMware vCenter Server Appliance 6.7 and wanted to document them in case it happens again to me or someone else that may come across this.
First, make sure your VCSA root password has not expired and set the root shell to be bash. This solved the error of it giving an error that the credentials were not valid despite the installation logs showing that it was in fact logging in but getting an error trying to run ‘date’.
Second, set DRS to ‘Partially Automated’ on your cluster you are deploying this to during the installation so that your new appliance does not move in the middle. This will cause the upgrade to freeze without any errors on the installer side.