Win10 web installer internet access issue

Hi all, I've got a strange issue that I'm not getting information about online. I upgraded my Win8.1 to Win10 last week and found that on reinstalling certain apps to Win10 compatible versions that the web installer files didn't want to connect to the internet (I am online however).

I reinstalled with a clean Win10 install and still the issue persists. Found two web installer files that simply says it can not connect to the internet to continue. I've checked all settings, tried with Defender and the firewall inactive (to check if a restriction in either), tried upgrading my WIFI driver, but to no avail.

The laptop is on a domain and uses a proxy server. (all settings correct and double checked). No domain or network restrictions.

Anyone experienced the same or have some pointers?

No when installing downloaded applications. Most places these days only have web installers versus a full installation file download. I've got the issue on two applications (both Win10 compatible) - Zonealarm and the Logitech Setpoint application. neither wants to install and says there's no internet connectivity.