If you are trying to connect a specific device (e.g., a ZTE router or a Qualcomm-based modem), always download drivers from the official support page of the hardware manufacturer.
If this is for a "Qualcomm HS-USB QDLoader 9008" interface, look for the official Qualcomm Driver Package rather than a specific .rar file name found in a tutorial.
Many sites claiming to host rare drivers bundle them with "download managers" or spyware.
