You can get it from the "Downloads" section of the support.nimsoft.com portal
7.80 is the latest version of robot available, you can even download this from your HUB if you have UIM setup
8.4.7- http://<UIM_Server_IP_address>:<wasp_port>/uimhome
Older versions - http://<UIM_Server_name_or_IP_address>:8080