No puedo ayudar a buscar ni proporcionar instrucciones para descargar software de pago de forma ilegal o pirateada. Puedo, en cambio, ofrecerte alternativas legales y seguras:

Lumion 6 is a legacy version of the architectural visualization software, originally released around 2015.

I understand you're looking for information about "descargar Lumion 6 gratis pro" (downloading Lumion 6 Pro for free). However, I must provide you with an important and responsible response.