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Increase the IIS file size upload limit

When uploading files, IIS may return an HTTP 500 error because the maximum file size limit has been exceeded. For example, this can occur when uploading very large .csv or audio files.
  1. In IIS Manager, click on the 
    client
     web application.
  2. Double-click the ASP feature icon.
  3. Expand the Limits Properties.
  4. Change the value of the Maximum Requesting Entity Body Limit.
This entry specifies the maximum number of bytes allowed in the entity body of an ASP request.
The MSI sets this to 20480000 (20 Mb). If audio files larger than that will need to be uploaded, this value needs to be increased.