You can simulate a 5G base station or phone on your laptop and have them talk over your network or localhost. You can even use an SDR to have them talk over the air (local laws allowing)
"Download the simulator" dumps source code for a proprietary (and very expensive) tool. I see no examples on how to run this. Some of the links on the linked page 404.
It's potentially using a bunch of Matlab toolboxes, being a communications related tool, but it's always worth trying to run Matlab code in GNU Octave.
Wonder why they don't put it on github... I feel MUCH more comfortable browsing "open source" code on somewhere like that than I do downloading and extracting a .zip archive from a random website.
No, he really should. Unzip is not the only software interacting when downloading things. A browser has way better sandboxes than the rest of the operating system and desktop environnement.
[1] 5G Physical Layer:
https://www.ericsson.com/en/reports-and-papers/books/5g-phys...