The PowerShell script contained in the Windows install instructions lists 'LOCALAPPDATA\mpv\scripts' as the install location for the 'mpvSockets.lua' file.
The correct location is 'APPDATA\mpv\scripts'. Therefore, the PowerShell install script should be;
Invoke-WebRequest -OutFile "$env:APPDATA\mpv\scripts\mpvSockets.lua" "https://raw.githubusercontent.com/wis/mpvSockets/master/mpvSockets.lua"
Easy fix.
The PowerShell script contained in the Windows install instructions lists 'LOCALAPPDATA\mpv\scripts' as the install location for the 'mpvSockets.lua' file.
The correct location is 'APPDATA\mpv\scripts'. Therefore, the PowerShell install script should be;
Invoke-WebRequest -OutFile "$env:APPDATA\mpv\scripts\mpvSockets.lua" "https://raw.githubusercontent.com/wis/mpvSockets/master/mpvSockets.lua"
Easy fix.