There is nothing wrong with your Internet. Installing LabVIEW is difficult, and has gotten more difficult with the release of the NI Package Manager for doing installation with the release of LabVIEW 2017.
I (and others) have written numerous responses in the Forum about how to install LabVIEW without errors. It starts by a careful removal of all NI software (and by "careful", I mean if you do it by "brute force", you will never be able to install LabVIEW without wiping your hard drive and reinstalling Windows).
The "secret" to installing LabVIEW is to do it was we did it 12 years ago -- one module at a time, with reboots in between, and installing Device Drivers last. There was a period (from around 2012 through 2016) when you could choose everything from the beginning, and NI would install things in the correct order, but NIPM undid all of this.
Do some searches on the Forum covering the last month or two, looking for solutions involving installing LabVIEW.
Bob Schor