Maintenance for the week of April 6:
• [COMPLETE] ESO Store and Account System for maintenance – April 9, 9:00AM EDT (13:00 UTC) - 6:00PM EDT (22:00 UTC)
I cannot download ESO because my computer considers it malicious software.
It sounds like maybe a firewall/antivirus/security software deems ESO suspect. You can try looking at the settings for the software or trying different software for that purpose that isn't quite so over zealous.