What build of VP 18? What CPU/GPU? What footage does this happen with (jpegs, 8-bit AVC from a camera, download from YouTube, OBS, etc.)? If only certain footage try using MediaInfo to answer specifically: https://mediaarea.net/en/MediaInfo
I would download and install the latest Studio driver as you are doing. For folder- just a place you can find it again is enough. Once you install it you can delete the downloaded file.