Unable to upgrade to macOS High Sierra on my MacBook Pro 2010
I inherited a 2010 MacBook Pro...it's running Lion 10.7. I can't get into the App Store ("not available") to download High Sierra (the best this old thing can handle). Most webpages don't load as Safari version 6 or something like that. Trying to set this old machine up for a friend for simple email and safari. Any ideas as to how I can put high Sierra on the machine? My understanding is that that's the best this old thing can do. All thoughts welcome, and thanks in advance.
[Re-Titled by Moderator]