How to re download games onto a new PC? Not showing up in library!

Thanks for reaching out, WolfyBean!

To check, do you see the transaction for Gears of War 4 listed when you sign into your
Microsoft Account Order History? When did you originally purchase Gears of War 4?

Also, just to make sure, are you signed into the Xbox App with the same account that you originally used to purchase Gears of War 4, on your previous PC?

You can't find the game in the store? It's showing up in the store for me. Try hard resetting your Xbox to see if it appears in your game library to be re-downloaded, or if it shows in the store for you.

I used a laptop/chromebook and it's not showing anything up for where I can install my games onto the hard drive but won't it just re-format the hard drive back onto the xbox?

Because when I plugged it in, it showed up as a new device

You need to download the arcade title onto the new account before it will show up, see my above post for information on how

Do you own the game on disc or digital? If it's disc, then that will be why the game does not show in your library on PC, as you need to own the digital version for that to show up in your PC library.