Hello there,
There is a chance that at the time you ran the curl command, the website that hosts the installation script was being redeployed. Could you check if you still get a 404 now?
If so, do you also get a 404 when navigating to https://install.fuel.network/ in a browser?
If curl still isn’t working for you, you can manually download the installation script here: fuelup/fuelup-init.sh at master · FuelLabs/fuelup · GitHub
And run it like so:
chmod +x fuelup-init.sh
./fuelup-init.sh