Which is the correct product upgrade to acquire that contains software assurance? Thanks for your advice.

Hello and apologies for the delay. I have sent this to our customer support team and we should have an answer for you shortly. 

Hello - I've been updated that you should now have an email from customerservice@techsoup.org answering this question for you. If there's anything else we can help with, please let me know. 

you can not use https://www.techsoup.org/products/windows-operating-system-upgrade-ls-47919- to upgrade home to pro.

you will need https://www.techsoup.org/products/windows-pro-full-operating-system-get-genuine-l-47924-  this will bring your home to pro (no SA)