We are upgrading an ISE deployment from 2.1 patch 7 to 2.4. Do we need to patch the 2.1 deployment to patch 8 (Latest) prior to upgrading to 2.4 or is 2.1 patch 7 sufficient to upgrade from?
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Can you guide here. Does customer has to purchase any licenses to upgrade from 2.1 to 2.4
Customer has ISE on VM . Also, i did not get when you say apply patches and upgrade versus fresh install.
Which is recommended upgrade or fresh install.