The foremost advice you may get is to use a scraper or existing reverse engineer software download sites.
However, I don't think that's the way to do so.
Instead, focus on providing actual value.
Copying people's websites do not put any value on the table.
You may come up with a better layout such as graphical logo, but you need something better by delivering more.
I suggest that you hire a virtual assistant from the Philippines, India, Pakistan or other countries with a large non-native English speaking population.
Instruct your assistant to look for niche- specific sites specializing on software download.
This is the best way to progress because through this you can develop many ways to generate income.
Most of all, you are assured of targeted traffic as you're focusing on a specific niche instead of featuring scrape software you find in other sites.