Antonio, if you didn’t receive a license for Rack Pro then that was an error and an email to VCV Support should fix it.
Rack development blog - #73 by Vortico says:
Developers with a plugin published on the VCV Library should have received an email directed to their plugin’s contact address containing a free license for VCV Rack Studio Edition. If you did not receive this email, contact VCV Support stating your plugin name(s) and VCV account email."