there is no permanent way to get SketchUp Pro completely for free
period. This includes the desktop modeler, LayOut for 2D documentation, and iPad access. Educational Access K-12 Schools SketchUp for Schools
: A powerful, free, and open-source 3D creation software that supports modeling, rigging, animation, rendering, and even game creation.
Go to the official SketchUp website, create a Trimble ID, and download the installer.
The most direct way to use the full, unrestricted version of SketchUp Pro for free is through the official 7-day trial from Trimble. You don't even need to provide credit card details to start your trial.
You cannot permanently download the full version of SketchUp Pro for free. Websites offering "cracked" versions, keygens, or free activation codes are dangerous. Risks of Cracked Software