Because this is a specialized service tool, it isn't usually hosted on a single "official" consumer website. You can typically find it on reputable mobile repair forums or GSM hosting sites.
Unlike official drivers which are digitally signed and distributed via: download qcommtk-driver-setup-v2.0.1.1
Are you installing these drivers to flash firmware or for simple file transfers? Oppo USB Driver V3.1.9.1 for Windows Because this is a specialized service tool, it
Downloading and Installing QComMtK Driver Setup: A Step-by-Step Guide download qcommtk-driver-setup-v2.0.1.1