The library offers free wifi. I don’t think you can get free Wifi without paying(unless you go somewhere that offers free wifi). I don’t recommend you hacking into people’s Wifi(you can go to jail).
Answer:
Don't do it. People will sue you even though it was put on the internet.
Explanation:
Check for possible software updates, my reasoning for that is the computer could be trying to initiate an update but is stopped by the user if you don't want it to update go to settings and turn off auto update