Hello,
I have a simple question to make upgade ESXi 5.5 to 6 need I any licenses or it is connected with additional costs? Is it just enough in my profile page vmware do updates of keys / license ?? I have:
vCenter Server 5 Essentials
vSphere 5 Essentials Plus
And another question is can I install esxi as "fresh install" or I have only the opportunity to update the current version ?
If you have an active support and subscription contract, you can upgrade your keys at no cost, see how: VMware KB: How to upgrade license keys in My VMware
If you have vCenter and Update Manager, you can use the Update Manager to upgrade your hosts to latest version, but you must upgrade your vCenter Server and Update Manager to latest version first. But, if you don't have this deployed, you can just use the interactive installer to do the upgrade: Upgrading to VMware ESXi 5.5 using the Interactive Installer - Support Insider - VMware Blogs
If you have an active support and subscription contract, you can upgrade your keys at no cost, see how: VMware KB: How to upgrade license keys in My VMware
If you have vCenter and Update Manager, you can use the Update Manager to upgrade your hosts to latest version, but you must upgrade your vCenter Server and Update Manager to latest version first. But, if you don't have this deployed, you can just use the interactive installer to do the upgrade: Upgrading to VMware ESXi 5.5 using the Interactive Installer - Support Insider - VMware Blogs