I could scan with Logitech c920 cam using DAVID 3 software only. The driver provided on the DAVID USB drive doesn't work with DAVID 4.
The scan results aren't that great using Logitech c920 anyway. Takes too long to adjust the camera settings and the focus is limited.
Projector - Acer K11 / Acer P1285 SVGA HDMI 3200 Lumens (larger scale scans)
Camera - DAVID Cam 3 (preferred) / Logitech C920 HD Webcam (poor quality, doesn't work with DAVID 4)
Software - DAVID 3 / DAVID 4