Clyde is having a hard time using the new version of Photoshop Elements. They've completely redone it and he has to learn it all over again. He's thought about downgrading Windows since Windows 10 won't let him install an old version of Elements. It will work on Windows 7 though.
Adobe says it's not compatible, but there is a discussion on the Adobe Forums that users have gotten it to work with "minor issues." So if he can put up with that, he could try it.
Photoshop Elements isn't the only game in town though. GetPaint.net is a good option, and it's free.