license purchase

Signed in this morning and receive a note that my license had expired. No pop-ups ahead of time for any of the users. No emails to me (being the account manager) stating that my license was going to expire soon. We buy our licenses every three years, so unless I put something on my calendar...

My company have purchased "parallels desktop for Mac home" version 5 licenses. If My company need to use more than one license additional, what license should Our purchase? Do My Company need to purchase "parallels desktop for Mac Business edition" 1 license? or "parallels desktop for Mac...