Connecting the MULTI-Module to a Windows PC requires drivers to be installed. There are two different driver packages which may be needed.
Install both drivers if you're not sure which one you need.
MULTI-Module (a.k.a. 'Maple') USB
The MULTI-Module (also known as 'Maple' or 'native') USB drivers are needed for MULTI-Modules which have a USB port which connects directly to the STM32 microprocessor in the MULTI-Module.
Modules which use this driver include:
Original 'Banggood' STM32 4-in-1 modules
iRangeX IRX4 Plus
Jumper JP4IN1 (older version)
Vantac MPM Lite
The easiest way to install the MULTI-Module USB drivers is to download Flash Multi, which includes an installer for the drivers.