If you're using linux you could always download a XSLX to CSV converter, then automate it in Cron. You'll probably need to write a short script, something along the lines of if .XLSX file exists in this folder, run conversion tool and just get Cron to run that script every 24 hours.
Not sure how you'd go about it with windows, although you could probably do something similar using Scheduled Tasks (Windows version of Cron)
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