How can I update from Maximizer 2016 Group to Maximizer 2018R2? Where can I download Max 2018R2 Group Edition? Can I run both Max 2016 and Max 2018 at the same time on my server so we can compare them?
Maximizer 2017 was last group edition and any thing beyond that comes as Maximizer Enterprise. If you are on group edition and wants to move to Maximizer 2018R2 or Maximizer 2019R3 then it will be enterprise.
You can not run two Maximizer Editions on the same server or connecting with same SQL Server.