Classifier design for website screenshots
Yes, instead of image classification you should look to scrape the websites themselves to get to file links or down messages directly.

You could still use an ML to determine down messages with minimal user input but it will be much faster and easier than image recognition. 

Image recognition will fail you here because to start you have a population of 100 or so which is a small sample and you'd need to hand label at least 50 to train any kind of viable classifier at which point you might ad well just hand label them all.