MT4 installation help please

I am trying to install the Pepperstone version of Mt 4 on my Windows 7 machine. I do not have any proxy of any kind, and strangely, I already have 2 other MT4s running on this machine. I have opened Port 443 just in case with no result. If I cancel the proxy window, then the install just fails. I am sure there must be a setting on my machine that is causing this, but have no idea what it may be.
Please see the screenshot for details of the problem.

I have contacted Pepperstone Live Chat and they are unable to help. I have contacted their support twice without any reply.

I am at a loss to explain this proxy request for proxy info, and would be grateful for any suggestions.

Many thanks.

The closest answer found on google:
https://fxtrade.oanda.com/community/...1#post-9885253

Many thanks for the reply. Yes, I did Google it before posting, but have still no solution.

My ISP are not interested as I expected. I can not see how to allow the install through the firewall, as it has to install first before I can to grant access permissions, which it will not do.

Lost quite frankly.