Just realised what the problem could be - Bitdefender!!!
Went looking through the logs and guess what I found
Online Threat Prevention
We blocked this dangerous page for your protection: http://patch.discoverygc.com/20231130-hotfix.zip
Accessed by: dslauncher.exe
Threat name: Gen:Variant.Zusy.527908
Dangerous pages attempt to install software that can harm the device, gather personal information or operate without your consent.
Yes, you can selectively, temporarily disable the scrutiny of Bitdefender concerning uploads/patches from the net with a simple slide button. Had the same problem, but forgot how this button is called and am at work right now
PS: appears to be "online threat detection" slider.