What steps should be taken to enable downloading of file names containing "+" in IIS?

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1. Open IIS Manager and navigate to the website for which you want to enable downloading of files with "+" in the filename.

2. Click on the "Request Filtering" icon under the "Feature Delegation" section.

3. Find "File Extensions" under the "Request Filtering" view and click "Edit Feature Settings".

4. In the "Request Filtering Settings" window, scroll down and find the "Allow Double Escaping" checkbox. Check the box to enable it.

5. Click "Apply" and then "OK".

6. Restart IIS or the website for the changes to take effect.

After completing these steps, files with "+" in the filename should be downloadable without any issues.