DavidR
3
I use firefox as my browser of choice on my three systems XP Pro, Win7 and win10 and have no problem with downloads.
Can you give to one of the download locations and I can try it.
I would try ideaIU-2016.3.exe shown in your first video but without a domain that is a non starter.
Usually when turning off the shields if it resolves the problem it is an indication of conflict, but what is the question. Are you actually getting any avast or browser error messages displayed ?