Hello, For the 11th generation servers, there wasn't a software license to upload. That began in the 12th generation and continues to today. On the 11th gen, the iDRAC Enterprise was activated by just installing the iDRAC Enterprise card. Once the card is installed, you should be good to go. 
I've got an R610 (BIOS 6.6.0) with an iDRAC 6 Express license on it.  I have bought and downloaded an iDRAC Enterprise license which I'm trying to install, but cannot find the place to upload it. Online help all seems to point to a License tab.. somewhere (never says under which left-hand item).. but I've searched the entire iDRAC web interface and cannot find this tab. Under the general System menu I've got Properties, Setup, Power, Logs, and Alerts. Under the iDRAC Settings menu I've got Properties, Network/Security, Logs, Update, Session Management, and Troubleshooting.   None of the above tabs seem to have a place to upload a new license. Am I missing something, or is there some problem here?  
PowerEdge R610 iDRAC license upload