Prior to 26-Aug-2023 (apparently when our jFrog Aartifactory server was upgraded to "EnterpriseX license 7.39.4 rev 73904900") my Jenkins scripts were successfully using an rtDownload with a wildcarded pattern as such:
?? rtDownload( serverId: "Artifactory",
spec: """{
"files": [{
"pattern": "our-product-generic-stable-local/WinPrereqs/2022/(asterisk)",
"target": "installer/Prerequisites/

",
"flat": "true" }]
}""" )??
Note, "asterisk" is spelled-out to prevent JIRA markup interpreting it.

Now those command are yielding an error:
 [Thread downloader_0] downloading C:\windows\TEMP\2935340218335602811\WinPrereqs/2022/.NET Framework 4.6.1/NDP461-KB3102436-x86-x64-AllOS-ENU.exe0 as part of file our-product-generic-stable-local/WinPrereqs/2022/.NET Framework 4.6.1/NDP461-KB3102436-x86-x64-AllOS-ENU.exe threw an exception: java.io.IOException: Could not create nor write to file: C:\Windows\Temp\2935340218335602811\WinPrereqs\2022\.NET Framework 4.6.1\NDP461-KB3102436-x86-x64-AllOS-ENU.exe0

[Note, I find the final '0' character curious, but maybe its nothing.]