That's weird. I would expect some kind of error message.
There is no way to install the separately downloaded file manually yet. I just wanted to check that you are able to download the full file.
Could you please try:
1. Running the Windows "Disk Cleanup" tool on your system disk and cleaning the "Temporary Internet Files" and optionally also the "Temporary files". With some luck, this may fix the issue
2. If 1. does not help, please try downloading the installer pack file manually using Internet Explorer (not Edge). Just checking this will help us in debugging this issue.
If we're not able to fix this issue, I'll add a workaround where you'll be able to download the file manually and tell the installer to use the local copy.