Best Offline way to play AOE2?

I am making an arcade machine that features "ancestor simulators".

First we were able to get Sim City 2000 to run. Now we are working on AOE 2!

I played this game A LOT when younger and wish I still at least had the CD's. But, times have changed. It's 2020 and I'm trying to figure out how to play the game without needing to use the internet?

To be precise, I am using a Windows 10 single-board-computer such as the LattePanda v1.0. It's a super simple machine and can play these games just fine - if you can find them!

So what's the best strategy currently? I want to make it as reliable and official as possible. Do I need to find an old CD? Can I pay once on a website, install, then be good to go? Does Steam do an offline version?

Ideally I just need a shortcut on the desktop. I can take the rest from there. It also can't need to call home or verify monthly or have any weird loading process that involves a 3rd party portal. Think arcade machine simple...

Thank you for any tips I look forward to bringing it back!