Sorry for the link, I updated my post to let you copy/paste it because it's special link to the Microsoft Store.
Can you open an Explorer window, go to the folder C:\Program Files\WindowsApps\eTeks.SweetHome3D_6.4.1.0_x64__y7v7etvrysvmm\Sweet Home 3D and check if [font=courier new]SweetHome3D.exe[/font] file is there?