You need to go to Welcome - HPE Software Support
You will also need your SAID or order number to access it - proof you purchased the software. At that point, you can go to the download section and access the current and previous versions.
Do you already have SW connectors and you are trying to migrate to ArcMC or you want to get new ArcMC SW? Send me your SAID in a private message and your e-mail address and I'll see what needs to be done.