Zeiss Inspect Optical 3d demo install

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I cannot get the Zeiss software demo to run. I am connected to the internet, but I get the message below. Also, trying to install an update and it says the file is corrupt. The support does not even seem to work. Is this what I can expect from software?

 

[[Na...]]

Hello,

please make sure the Suite can connect to the internet. Here is a list with URLs, which must not be blocked:

ZEISS Quality Tech Guide

and an article on the free license: ZEISS Quality Tech Guide

Nanno