You can install the majority of iZotope product via our Product Portal here:
Download for Mac Download for PC
Exponential Audio Products aren't yet compatible with the Product Portal, you can download those here:
Download PhoenixVerb Download Excalibur Download R2 Download R2
iZotope products can be easily authorized via Product Portal. You can see full authorization methods broken down for them in this article.
Exponential Audio products have a separate authorization process through iLok, this can be seen in this article.
Most of the products sold by iZotope are not Standalone applications. These require a host application to run. Be sure to check individual product specification pages for compatibility, you can see DAW-specific setup steps in this section.