@NewWorldHero
I understand what you're writing as follows:
I have Linux Mint 22.2.
Why don't you tell me where the *deb 0ad file is in version 0.0.23?
Of course, that would be the simplest.
But it's IMPOSSIBLE.
0ad ver. 0.0.23 (0.0.23b, Debian 0.0.23.1) was released in May (December) 2018.
https://releases.wildfiregames.com/
Linux Mint 22.2 was released in August 2025.
https://pub.linuxmint.io/stable/22.2/
Linux Mint 22.2 is based on Ubuntu 24.04 LTS, Noble Numbat, released in April 2024.
https://en.wikipedia.org/wiki/Ubuntu_version_history#Table_of_versions
Six years passed between 2018 and 2024.
Systems from 2024 no longer contain the package versions that 0ad 0.0.23 requires.
Such old packages (boost, icu, and whatever else) cannot be installed on new systems.
Therefore, it can't be done.
The only thing left is to find an older distribution for which this version was available and install it on a USB flash drive as if it were a hard drive.
Ubuntu 22.04 LTS Jammy includes 0ad already in version 0.0.25b
https://packages.ubuntu.com/jammy/0ad
I found such a distribution for you – Debian Bullseye 11.11, which, moreover, still has the repositories enabled.
Speaking of which, the Bullseye repositories won't be disabled until 2026-08-31.
https://wiki.debian.org/DebianReleases
You'll easily be able to install both the system and 0ad 0.0.23.1 on a USB flash drive before the repositories are disabled.
After installing, keep the USB flash drive in a drawer, and when you want to play, you take it out, start your PC, and play.
When you decide that's enough, you turn off your PC, disconnect the flash drive, put it back in the drawer, and then start your Mint.
And you can go on like this forever.
Well, maybe not that long – until you replace your PC with one that Bullseye can't handle.
Happy New Year!