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If you are getting redirected to the supplicant provisioning portal you will need to make sure that java is installed and running on the browser since the java applet is what opens the supplicant provisioning portal.
Give that a shot and see if your luck changes, also give the session around 30 seconds to start you should see it come up. (i would recommend mozilla since the plugin option will show up right next to the browser bar.
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For Agent Download Issues on Client Machine
Ensure that a client provisioning policy exists in Cisco ISE. If yes, verify the
policy identity group, conditions, and type of agent(s) defined in the policy.
(Also ensure whether or not there is any agent profile configured under Policy >
Policy Elements > Results > Client Provisioning > Resources > Add > ISE
Posture Agent Profile, even a profile with all default values.)