Hi @Anonymous
Make sure all of the updates are installed
2016 needs to also have the updated TLS:
https://knowledge.autodesk.com/search-result/caas/sfdcarticles/sfdcarticles/Meta-licensing.html
Question, are you on subscription ( and showing 2020 in your account)
If so, then you won't have access to 2016, you're only able to use 2020 and 3 prior versions 2019-2017.
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Mike Davis