After you click the Download button, it does not take you to a new window or new page, instead it will ask you whether to run it or save it. See screen shot below (your screen may look different but similar):
You can choose Run if it is available, and skip to step #6. Otherwise You choose Save.
Click the yellow folder icon on your task bar to open the Windows Explorer:
Click Downloads folder from the Quick Access list:
In that folder, you should see a file named Solid3D-####-setup.exe, where #### is your scanner number.
Double-click on Solid3D-####-setup.exe.
Windows will show warning that it is not safe to run. See below:
Click More Info, which will display the option Run anyway
Click on Run anyway.
Now Solid3D has been installed under C:\Solid3D folder. And a shortcut has been created on your desktop. Please watch the demo video before scanning.