If a file won’t downoad it is because browsers and anti-malware programs are trying to protect your PC from external threats, and this can have unintended consequences.
There is more about that here:
Norton Internet Security can be too secure (!)
You can disable Download Intelligence temporarily for the time it takes to download the program. Do not disable Norton Auto-Protect.
How to do this: In Norton go to Settings > Web > Download Intelligence > change to Off at top of page – Select Apply > select a time and OK.