Simple, but a little hidden:
- Open IIS
- Click on “Application Pools” :
- In the side panel (right) click on “Website” you want to change the framework:
- Sidebar, locate the “Edit Application Pool” and then click Basic Settings
- Clicking on “Basic Settings …” will appear the following selection screen FrameWork:
- Now, select the framework of your choice by clicking on the list. NET Framework Version:
- Once selected click “OK”