Extra Modules - maven-artifact

Hi,
Has anyone successfully utilised this module and able to avoid failures?

Managed to define to correct address for maven-metadata.XML but getting an unknown error.

msg: Failed to download maven-metadata.XML because of An unknown error occurred: an integer is requiredfor URL ... correct URL shown

Tried with and without username and password same error message, can't find any reported issues.

Anyone know how to resolve?

Paul