You can buy second hand copies from ebay, although most of them are for Mac and/or have ridiculous prices considering their age. In terms of running them, i ha

You can buy second hand copies from ebay, although most of them are for Mac and/or have ridiculous prices considering their age. In terms of running them, i have Photoshop LE (a trimmed down of photoshop) from 1995 running on Windows 10, it works although it was a bit tricky to install it because the installer is 16bit (i used https://github.com/otya128/winevdm https://github.com/otya128/winevdm which adds emulated 16bit executable support to 64bit windows, but even then the installer failed to register something. However the files were copied fine and i just grabbed them and copied them to another folder as the original was getting deleted by the installer after the failure). I guess later versions will be easier to make work (and frankly, chances are these very old versions are most likely already far surpassed by Krita, which has a similar UI).