HELP! I'm unable to upgrade from 10.3 to 10.4

Noob here. Have a techy background but this is all new to me. Running HA on an i5, 8gb, 256ssd. It has been working fine up until now. I’ve tried doing the update for the past few days and it just looks like it’s doing something but never actually does. I’ve tried rebooting the machine several times. Ideas on where to start? This is the log

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Network issue. You system cannot access GitHub. Check your router, DNS, gateway entry, etc.

I’ll check into that. Thank you.

It was being blocked by my router. Issue resolved, Thanks again.