Here are direct driver+loader links for popular models. Update the URL base with your trusted source.
If your Oppo or Vivo device is not being recognized or shows a yellow exclamation mark in the Device Manager, follow these steps to fix the link: oppo vivo usb driver fix 9008 link
Use QFIL (example procedure)
A combined package for Qualcomm and MTK drivers is available via the AndroidFileHost repository . Step-by-Step Fix Here are direct driver+loader links for popular models