> and couldn't upgrade because Apple didn't support my hardware anymore.

If you really want, you may be able to upgrade the OS anyways with https://github.com/dortania/OpenCore-Legacy-Patcher.

Or use Homebrew on the old OS with TigerBrew (https://github.com/mistydemeo/tigerbrew), but people online suggest MacPorts, not only because it has first-party support but also because it’s apparently better designed.