The asset servers require TLS 1.2, try enabling TLS 1.2 in Internet Options somewhere in control panel. I'm not really able to guide you how to do so since I haven't used Windows 7 in ages.
world files (including set 3 of backups) https://drive.google.com/file/d/1vKfAf21GtdzefV26x917RLxAJ5mC9wlo/view?usp=sharing
i'll try to get set 1 of the backups on here soon
getting set 2 is pretty much impossible
IM CURRENTLY TYPING THIS IN THIS FOURM AND YOU CAN TOO
ALSO YOU CAN PLAY MINECRAFT IN WINDOWS XP!!!
also im not energetic im just telling you plz dont bully me D: