Hi dpwatson,
My apologies for the confusion. The installer for AccountRight Basics, Standard, Plus, and Premier is the same. The specific AccountRight product and features you'll have access to are determined by the company file. To download the installer, visit this page: https://www.myob.com/au/support/downloads?page=4, then select the AccountRight PC Edition (refer to the attached image) and download the desired version.
Regarding your second question, yes, you can have multiple versions running on the same PC. For more information, please refer to this posts. Can you run 2 versions of MYOB?/Multiple versions of accountright
Feel free to post again, we're happy to help!
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Regards,
Earl