Since I do this semi-professionally now, I have bought licenses for Viva Pro and Diamant Dustbuster+, both of which were used here, along with After Effects & Photoshop -the new Genrative Fill feature helped fill in some of the larger areas of black scratches - the ones where there are so many scratches they almost form a black rectangle that lasts for a dozen frames or more:
At least 4 hours of manual painting, cloning, etc.