Content-length not returned

I want to get the size of the download file for a progressbar.
This request not returning the content-length.
Anybody maybe know why?
Thanks,

curl -I https://www.xxxxx.co.za/downloads/XXXXXSetup.exe
HTTP/1.1 200 OK
Date: Thu, 23 Jul 2020 15:06:13 GMT
Content-Type: application/x-msdownload
Connection: keep-alive
Set-Cookie: __cfduid=d83a67bcac2949d620dd2808de93e1e911595516773; expires=Sat, 22-Aug-20 15:06:13 GMT; path=/; domain=.xxxxx.co.za; HttpOnly; SameSite=Lax; Secure
Last-Modified: Wed, 22 Jul 2020 14:07:33 GMT
Vary: Accept-Encoding,User-Agent
CF-Cache-Status: DYNAMIC
cf-request-id: 041dcefb470000b412b435e200000001
Expect-CT: max-age=604800, report-uri=“https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct
Server: cloudflare
CF-RAY: 5b764dd87d29b412-DUR

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