Download Meshroom from Meshroom home page
extract ZIP to a folder of your choice
If you don’t have it installed already, you need to install the Microsoft Visual C++ Redistributable Package 2015, 2017 and 2019 available on Microsoft’s Support portal.
You can start Meshroom by clicking on the executable. No extra installation is required.
Do not run Meshroom as Admin. This will disable drag-and-drop.