The eval link hasn't been updated yet with Drive Encryption 7.1.
EEPC 7.0.x does not support ePO 5.1, Drive Encryption 7.1 and above support ePO 5.1.
You can refer to these links for more information : https://kc.mcafee.com/corporate/index?page=content&id=KB79422, https://kc.mcafee.com/corporate/index?page=content&id=KB76804
With a valid grant number, you will be able to download DE 7.1 from the McAfee Product Downloads site. Else, can you please your Sales Rep for assistance with the eval ?
And you don't have to necessarily install the full suite to use Drive Encryption.
Thanks, I did go back to the Sales Rep and they worked with McAfee to get me an updated download, now installed on my EPO.