My office uses ZScaler
The Online Installer is unable to download repository.txt
I presume it is giving off signals that makes the zscaler system think it is a new browser rather than a binary trying to obtain a file. If this is the case there is no way / interface to log into zscaler such that the installer will get past it.
Please provide binary / offline installers. This really shouldn't be an issue.
I have added the zscaler certs to the system trusted store, but it doesn't appear that the installer uses that, or if it does, for the mentioned reason, something is blocking it.