In the pre-setup instructions (Installation Guide/Preparing for Installing Acumatica ERP), it says to enable these IIS features.
![](https://uploads-us-west-2.insided.com/acumatica-en/attachment/5eb4dc85-fd09-49ae-b559-f69d12609dd0.png)
It should clarify that only ASP.NET 4.7 (or appropriate ASP.NET version for the installation) needs to be included. Not ASP.NET 3.5, which is usually an option in IIS setup (see below).
![](https://uploads-us-west-2.insided.com/acumatica-en/attachment/061d7c3f-b825-4e22-b3f0-a9fd6a6ad5b6.png)