Since upgrading to ColdFusion 2016, downloads that are aborted or timed-out now throw a CF error. Here's some sample code on how to prevent it using try/catch.

download_with_cfcatch.cfm

<!--- 20200103
  Since upgrading some applications to ColdFusion 2016, downloads that are aborted or timed-out now throw a CF error.
  Here's some sample code on how to prevent it using try/catch.
  https://gist.github.com/JamoCA/52c17718ab6a4e047994c6bf3f7dd1f4
  https://dev.to/gamesover/using-try-catch-to-suppress-aborted-download-errors-3j42
--->

<cfset FileData = {
	"name" = "Filename with Spaces.pdf",
	"path" = "c:\files\File12345.pdf"
}>

<!--- increase timeout as request will take longer as user may have to specify download location --->
<cfsetting requesttimeout="1200">

<!--- Use double quotes for filename in case it contains spaces --->
<cfheader name="Content-disposition" value="attachment; filename=""#FileData.Name#""">

<cftry>
	<!--- Use "application/unknown" instead of file-related mime type in order to force download --->
	<!--- Use "deletefile" flag to be safe (Past bug: CFMailParam defaults to "no", but still deleted the file.) --->
	<cfcontent type="application/unknown" file="#FileData.Path#" deletefile="No">
	<cfcatch>
		<!--- log failure; optional; it's good to have this data in case there's a pattern of failure --->
		<cflog file="aborteddownloads" type="information" application="yes" text="#CGI.Remote_Addr#|#FileData.Path#|#CGI.HTTP_User_Agent#|#cfcatch.message#">
		Download Aborted
		<cfabort>
	</cfcatch>
</cftry>