Windows 10 modem install instructions

Follow this link to download the zip file which contains the .inf and .cat files, to install this modem extract the files then go to Device Manager, under "Other Devices" "USB Composite Device" or under "Modem, look for an error (modem connected) right the error click "Update Driver Software", browse to the folder containing the .cat and .inf, your modem will install.

For MT9234MU-CDC-XR
https://www.multitech.com/models/93537298LF#

For MT9234ZBA-CDC-XR
https://www.multitech.com/models/93537163LF