You can use a Proxy/VPN.
If you were IP banned, you can try and change your IP with the following solution.
However, there's no guarantee it works on your side.
Ever since the new update, you cant use multiple accounts on the same ip. How would i assign different ip's for different windows if thats possible (what program would i need etc,) or will i have to stick with using one account from now on?
You can use a Proxy/VPN.
If you were IP banned, you can try and change your IP with the following solution.
However, there's no guarantee it works on your side.