Do I have to donate to get the driver?

When your requirements call for an old version of Windows, generally you have a specific piece of software you want to run, so start by choosing the version most widely used at the time, which sometimes isn't the latest version. And you should always experiment, because there are thousands of things which contribute to stability. Newer (or older) version of Windows could be better or worse, depending on your specific case.

Regardless which version you pick, treat them as a security risk and (if you're in a serious production environment) avoid giving them unrestricted access to your local network or unrestricted access to the wider internet.

Roberts acknowledged that NTS and NTW are included in the same binary file. It was easier to build and test them that way, he said. The setting in the Registry, he said, triggers 48 changes to the kernel. These changes cascade down to 700 additional settings in software outside the kernel.