Sisu Aika commented on NAM Team's file in Gameplay Mods
I had the same error as you, initially. In my case, I found it was because I had not installed
OpenJDK11U-jre_x64_windows_hotspot_11.0.8_10.msi
It will fail to progress past the initial prompt if you do not have this installed. Just a guess... hope you get it working!
