When does the Pro trial period start?

When I have downloaded the installer of SketchUp Pro, when does the 30 days period start? From the moment of download or of installation an running?


If I remember correctly it starts with first program start.

SketchUp Help Center: Try before purchasing says:

The trial begins on the day of installation and will continue for 30 calendar days at which time you will need to apply a SketchUp Pro license or opt to switch to SketchUp Make for further, non-commercial use.