I'm not sure how long this will be around for public consumption, but it maybe worth a look if Linux or the BSDs can't do what you need.
https://www.youtube.com/channel/UCMo8NP-2oP35rauon-Duc9Q
https://www.reactos.org/
I will also add, it would be smart to download the source code, learn how to compile the complete distribution and make it run. You never know how things might go in this fragile little world of ours. You might just find you are the only person on the block that is self-sufficient when the Internet is dead or dying and everyone else's machine that is so tightly tied to the Internet is no longer functional. If you have the source code and know how to use it, you become your only limitation.
https://www.youtube.com/channel/UCMo8NP-2oP35rauon-Duc9Q
https://www.reactos.org/
I will also add, it would be smart to download the source code, learn how to compile the complete distribution and make it run. You never know how things might go in this fragile little world of ours. You might just find you are the only person on the block that is self-sufficient when the Internet is dead or dying and everyone else's machine that is so tightly tied to the Internet is no longer functional. If you have the source code and know how to use it, you become your only limitation.