"@shindo @shanks [g]Q: Is this game cross buy?
A: Yes. Any piece of content purchased for the Xbox version will be available on the PC version (aside from KI Classic and KI 2 Classic) and vice versa. Full Cross-buy, both ways.
“In order to access your existing Killer Instinct content on Windows 10, Xbox One owners must receive the Season 3 game update, available starting March 29, 2016. Simply login to your Xbox One console and launch Killer Instinct. Ensure you’re connected to Xbox Live and follow the prompts to receive the update. Once the update is complete, launch Killer Instinct fully. Once the update is complete and you have launched Killer Instinct again, you will be able to login into Windows 10 to access your owned and earned content.”[/g]
http://www.neogaf.com/forum/showthread.php?t=1201912"