Opposition research on Trump will do little to effect the race
It is not because there isn't a plethora of negative information about Trump. There were substantial amounts of negative information about him during the primary. It is that his supporters don't care, and those who might will hold their nose and vote for him anyway because they despise Hillary Clinton more. Trump's negatives are already pretty maxed out at this point and piling more on him is unlikely to effect the race.
The opposition research group American Bridge is maintaining an archive of digital video footage, with 6,500 clips of Mr. Trump speaking or being mentioned.