Two weeks ago, I had trouble installing a download. Turned out that the anti-virus program had flagged it as a “Trojan” of some type and quarantined it, quite likely due to it containing code that had it “phone home” to get files/updates when it was installed. So, yes, disabling your A/V is a good try now. Oh - by the way, I had to re-download it after disabling the A/V.
Not sure when I’ll get to that but very helpful info.