It should be there. You might want to try uninstalling and reinstalling it again. 
I really hope someone can help. I found similar documents for ESX 5.5 and 8.1 but not 8.3 and 6.0; also this is the free version of esxi. I uninstalled OM 7.4 from my ESXi 6.0 server, updated using the dell ISO for update 2, and using esxcli installed OM 8.3. I confirmed it shows installed with the esxcli command. I have installed OM 8.3 webserver on a server 2012 R2 box.   Every time I try to connect I just get Login Failed... connection error. I can't find anything in the logs on the 2012 box and everything on the ESXi box appears to have been installed correctly. I had this working on 7.4 but would really love to upgrade to the latest OM now that I am on update 2. Any thoughts and help would be greatly appreciated? 
OM 8.3, ESXi 6.0 Update 2 - Login Failed... Connection error