Can you try putting "@" before the filename. Like below.  curl -u admin:admin -F "keystorePassword=admin" -F "keystorePasswordConfirm=admin" -F "truststorePassword=admin" -F "truststorePasswordConfirm=admin" -F privatekeyFile=@"localhostprivate.der" -F certificateFile=@"localhost.crt" -F "httpsHostn...

https://experienceleague.adobe.com/docs/contributor/contributor-guide/introduction.html?lang=en#report-an-issue

The release note for each service pack explicitly calls out the uber-jar details. For example the uber jar details for the latest service pack (6.5.17 as of today) are available here  For previous versions look for specific service pack page. For instance 6.5.16 look here. Last but not the least, ne...