Can TP-Link provide an official alternative to MongoDB so I can run a supported and updated version of it on my non-AVX enabled CPU? 

I cannot update past 4.4 as anything after 4.4.something requires AVX which my CPU doesn't support and I cannot risk updating the server OS that Omada runs on for fear of it not allowing old unstable versions of MongoDB to run. Please just use a different database that does work without issue.