Let me explain on how to launch it. I'll be talking about the Windows version.

You will need Java 7 and up to launch the wallet.

First, download the wallet from: https://github.com/koto-dev/koto/releases (Windows and Mac version can be found here.)

http://prntscr.com/hw8dxv

Second, run the .bat file located inside the folder.

http://prntscr.com/hw8egn

Wait for the download to finish then proceed to the next step.

Third, execute the WalletUI.jar .

http://prntscr.com/hw8fdy

The wallet should look like this:

https://prnt.sc/hw8gkc

And that's it!