You are fundamentally draining bandwidth from Cloudflare, downloading files is not something you should do while using Cloudflare, you are breaking the 2.8 EULA agreement.
The Services are offered primarily as a platform to cache and serve web pages and websites. Unless explicitly included as part of a Paid Service purchased by you, you agree to use the Services solely for the purpose of (i) serving web pages as viewed through a web browser or other functionally equivalent applications, including rendering Hypertext Markup Language (HTML) or other functional equivalents, and (ii) serving web APIs subject to the restrictions set forth in this Section 2.8. Use of the Services for serving video or a disproportionate percentage of pictures, audio files, or other non-HTML content is prohibited, unless purchased separately as part of a Paid Service or expressly allowed under our Supplemental Terms for a specific Service. If we determine you have breached this Section 2.8, we may immediately suspend or restrict your use of the Services, or limit End User access to certain of your resources through the Services.
As I said before, I’m surprised your account has not been suspended or over-charged. If you want to download files while using Cloudflare, outsource that to a third party CDN or ask for a quotation to the enterprise sales team (fairly expensive).