Thank you for reaching out and I am happy to help!
I’ve checked your website, and as I can see the W3 Total Cache is installed and active, and the website opens without any issues.
Performance optimized by W3 Total Cache. Learn more: https://www.boldgrid.com/w3-total-cache/
Page Caching using disk: enhanced
Database Caching 1/219 queries in 0.361 seconds using disk (Request-wide modification query)
Served from: blog.casadodesenvolvedor.com.br @ 2021-10-08 09:19:06 by W3 Total Cache
Can you please share what is the file name or extension you are prompted to download and also can you please confirm that you are still experiencing the issue?
As I’ve already answered in the email correspondence, you should try disabling the gzip compression in Performance>Browser Cache, save all settings and purge the cache and see if the issue persists.
If the issue is gone after that it means that you have already had gzip compression or Zlib compression enabled on some level, server-side, or some other plugins and should keep gzip compression enabled.
Since you are using Cloudflare, you most likely have brotli enabled in Cloudflare also.