Best practice upgrading from 11.4 to 13.0

I'm going to be upgrading from NetVault 11.4 to 13.0

In reviewing the 13.0 release notes, I noted the section regarding potential authentication issues when upgrading from NetVault

I also noted that upgrades from 11.4.5 or later are supported when upgrading to 13.0

I had two questions:

1. If I'm at 11.4, what version should I upgrade to first, before going to 13.0?

2. If I'm at 11.4.5, and upgrade to 13.0, would the authentication issues encountered  when upgrading from occur?