Detection is fine but adding them doesn't appear to do anything. Just takes you right back to the same page.

 

License Type	: Free Edition
Company Name	: Zoho Corporation
Installation ID	: 582302000466481533
Build Number	: 11100
Latest Version	: 11200 [ Details]
Expires on	: Never
Maximum no of Devices	: 10
Maximum no of Users	: 1
Total Monitored Devices	: 8
Total Monitored Interfaces	: 0
Total Available Users	: 1