i just install cubism edito, but when i click on the "Enter License Key" window and click on the "License activation" button this dialog appears; "No Valid License Found".
why this happens, how can i get a 60 days pro licence?
That happens because what you are doing isn't the correct way to activate the PRO trial license, because it is the way how to activate a purchased license.
When you start up Live2D, there should be an option that says something like "Continue with Free version" and another which is "Activate trial". Choose activate trial.
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When you start up Live2D, there should be an option that says something like "Continue with Free version" and another which is "Activate trial". Choose activate trial.