For a lab setup, you can install a Virtual Mobility Master, and a Virtual Controller using evaluation licenes from the LMS portal.
This will work, and give you exposure to the MM and VC roadmap.
There is also the new process for converting AP's to IAP's.
You need at least a VC to be able to convert the AP.
https://community.arubanetworks.com/t5/Wireless-Access/AP-Convert-command-in-8-6/td-p/651557
Please read the cautions and caveats and understand that this is only for lab environments.