Can't install OS; Chicken and egg problem! Please help!

My internet is a little slow, but it works. Also, this time I set the time zone and wifi country code to where I am. (Doesn’t know if that affected anything)

The interesting part is, that your system seems to be able to get the first 2 files. After that, the connection times out. Could be some kind of overload or instability on the network/internet.

Do you have a different network you could test on? Or would it be possible to create a hotspot on your mobile phone. And you could try over that connection?

Get:1 http://raspbian.raspberrypi.org/raspbian bullseye/main armhf systemd armhf 247.3-7+rpi1 [4242 kB]
Get:2 http://raspbian.raspberrypi.org/raspbian bullseye/main armhf udev armhf 247.3-7+rpi1 [1430 kB]
Err:3 http://raspbian.raspberrypi.org/raspbian bullseye/main armhf libudev1 armhf 247.3-7+rpi1
  Cannot initiate the connection to raspbian.raspberrypi.org:80 (2a00:1098:0:80:1000:75:0:3). - connect (101: Network is unreachable) Could not connect to raspbian.raspberrypi.org:80 (93.93.128.193), connection timed out [IP: 93.93.128.193 80

I will try on a different wifi. It may not be today, tho. I’ll get back to you when I do!

Take your time. It’s Easter Holidays.

Btw, http://raspbian.raspberrypi.org/raspbian is the major Raspbian package repository, comparable to and moreless a clone of https://deb.debian.org/debian (used on all our other images, including RPi ARMv7 and ARMv8 ones) , but with packages compiled for the ARMv6hf architecture (RPi 1 and Zero models). It should be located in /etc/apt/sources.list. The /etc/apt/sources.list.d/raspi.list instead should contain https://archive.raspbeerypi.org/debian, which is the Raspberry Pi kernel and firmware repository, containing as well selected optimised builds for RPi, like Kodi and Chromium with RPi GPU hardware acceleration.

I’m not sure whether it finally is the same server, but you could also try to replace http://raspbian.raspberrypi.org with https://archive.raspbian.org or another Raspbian mirror. Can be also done in dietpi-config > Network Options: Misc.