How can I enable "URL Rewrite" Module in IIS 8.5 in Server 2012?

Download it from here:

http://www.iis.net/downloads/microsoft/url-rewrite

or if you already have Web Platform Installer on your machine you can install it from there.

Worth mentioning: you should download the x64 version!

From the main download page (https://www.iis.net/downloads/microsoft/url-rewrite) click "additional downloads" (under the main download button) and download the x64 version (because for some reason - the default download version is x86)

First, install the URL Rewrite from a download or from the Web Platform Installer. Second, restart IIS. And, finally, close IIS and open again. The last step worked for me.

Thought I'd give a full answer combining some of the possible intricacies required for completeness.

1. Check if you have 32-bit or 64-bit IIS installed:
   • Go to IIS Manager → Application Pools, choose the appropriate app pool then Advanced Settings.
   • Check the setting "Enable 32-bit Applications". If that's true, that means the worker process is forced to run in 32-bit. If the setting is false, then the app pool is running in 64-bit mode.
   • You can also open up Task Manager and check w3wp.exe. If it's showing as w3wp*32.exe then it's 32-bit.
2. Download the appropriate version here: https://www.iis.net/downloads/microsoft/url-rewrite#additionalDownloads.
3. Install it.
4. Close and reopen IIS Manager to ensure the URL Rewrite module appears.