The answer to your question is "Yes and No" due to a number of factors.
Windows Live Mail 2012 will install and function perfectly well under Windows 10 and should work just fine for the foreseeable future for POP and IMAP access to e-mail, as these protocols have remained virtually unchanged "forever" now. The only reason Microsoft stopped supporting it is because they didn't want to upgrade it to work with whatever their latest proprietary synchronization method is called.
One used to download from the Microsoft Windows Essentials Page, but shortly after the end of support date the download link was, unsurprisingly, removed. Unless you have an official copy from just prior to the end of support you are not going to be able to get one from Microsoft.
I've got WLM 2012 on my Windows 10 system because I work with blind and visually-impaired individuals and this particular e-mail client was, and remains, popular because it "plays well" with accessibility software, so I can definitely state that it works. I just fired it up the other day to do some work with it and the NVDA screen reader.
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1803, Build 17134
In a modern society where everyone thinks their opinion deserves to be heard nothing annoys me more than individuals who mistake their personal preferences for fact.
~ Commenter TheCruyffGurn on the The Guardian website, 8/13/2014