Rowingpitou - If you are on a Mac, then the AC 10 converter is the oldest you can run on an Intel Mac unless you have an old bootable version of Snow Leopard around. Snow Leopard was the last version of MacOS to be able to run PowerPC programs - which AC 9 and earlier for Mac are.
If you are on Windows - or have a Windows machine available - follow Erwin's advice.
Welcome to the forums - you can see from the response why it is important to say what computer/OS you are using as in my and Erwin's "profile" footer. Click the text link "Profile" near the top of the screen here to the left of "Log Out" to fill in your personal information so people can provide more accurate help in the future.
One of the forum moderators
AC 28 USA and earlier • macOS Sonoma 14.7.1, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB