Qualcomm QDLoader HS-USB Driver
Choose an appropriate version whether 32-bit or 64-bit which depends on which operating system running on your computer. The installer file is compressed within a .zip file so you may need either Winzip or Winrar to extract it. Grab it from the link(s) below:
QDLoader HS-USB Driver_64bit_Setup.zip
QDLoader HS-USB Driver_32bit_Setup.exe