If you haven't started a free trial for the On-Prem product, start one. After the trial is complete, you can use the trial license and the product will run in LITE mode.
If you've already started a trial, just copy the license file to your controller home directory. Product will run in LITE mode after the expiration of the trial.
https://docs.appdynamics.com/display/PRO44/Applying+or+Updating+a+License+File
On-Prem customers must grab the license file we email them and put it on their local host, as explained here>> Applying or Updating a License File
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