Sinden Lightgun install

[DarDarDad]

Pi Model or other hardware: 4B
Power Supply used: Official Pi
RetroPie Version Used (eg 3.6, 3.8.1, 4.1 - do not write latest): 4.8
Built From: Pre made SD Image on RetroPie website
USB Devices connected: USB keyboard
Controller used: Sindenlightgun
Error messages received: failed to install some .sh files (see logs)
Verbose log (if relevant):
Guide used: (Mention if you followed a guide):

Hi team, I got so far with following the guide but ran into the following errors after trying to install the sinden drivers.

Err:1 http://mirrors.fe.up.pt/raspbian/raspbian buster/main armhf libwebp6 armhf 0.6.1-2+deb10u3
503 Service Unavailable [IP: 193.137.29.15 80]
Err:2 http://mirrors.fe.up.pt/raspbian/raspbian buster/main armhf libwebpmux3 armhf 0.6.1-2+deb10u3
503 Service Unavailable [IP: 193.137.29.15 80]
Err:3 http://mirrors.fe.up.pt/raspbian/raspbian buster/main armhf libwebpdemux2 armhf 0.6.1-2+deb10u3
503 Service Unavailable [IP: 193.137.29.15 80]
Err:4 http://mirrors.fe.up.pt/raspbian/raspbian buster/main armhf libwebp-dev armhf 0.6.1-2+deb10u3
503 Service Unavailable [IP: 193.137.29.15 80]
E: Failed to fetch http://mirrors.fe.up.pt/raspbian/raspbian/pool/main/libw/libwebp/libwebp6_0.6.1-2+deb10u3_armhf.deb 503 Service Unavailable [IP: 193.137.29.15 80]
E: Failed to fetch http://mirrors.fe.up.pt/raspbian/raspbian/pool/main/libw/libwebp/libwebpmux3_0.6.1-2+deb10u3_armhf.deb 503 Service Unavailable [IP: 193.137.29.15 80]
E: Failed to fetch http://mirrors.fe.up.pt/raspbian/raspbian/pool/main/libw/libwebp/libwebpdemux2_0.6.1-2+deb10u3_armhf.deb 503 Service Unavailable [IP: 193.137.29.15 80]
E: Failed to fetch http://mirrors.fe.up.pt/raspbian/raspbian/pool/main/libw/libwebp/libwebp-dev_0.6.1-2+deb10u3_armhf.deb 503 Service Unavailable [IP: 193.137.29.15 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
Could not install package(s): mono-complete libsdl-image1.2-dev.

Anybody got any advice on how to fix it?