If you're looking for free or open-source alternatives to SketchUp, you might consider:
That being said, here's a general guide on how to download and install SketchUp 2021, and also some information about the potential "cracked" versions: como baixar e instalar sketchup 2021 crackeado exclusive
Antes de prosseguir com o download e a instalação, certifique-se de que seu computador atende aos requisitos mínimos do sistema: If you're looking for free or open-source alternatives