After one month I have finally manage to login again!
Was the problem resolved or is just pure luck?
I will write here more detailed info about the problem that i had.
After you @Saul changed that message I was unable to login.
Deleting cookies did not helped out.
Using different devices on different networks on different
operating systems and using different browsers did not helped.
I have tried to register a new account like above by using
different devices, browsers, networks.
I have had again problem with message saying that
is not allowed to register a new account from my IP address.
I have asked few other users to try to register an account on my behalf
and they got the same IP error message.
In case the problem is not jet solved please report this details to the forum developer.