It's supposed to work in Windows 10.
First off, see if rebooting the computer helps at all.
See if using compatibility mode helps at all.
If that doesn't work, try uninstalling and reinstalling.
Make sure there's no antivirus blocking part of the installation, or keeping the client from opening.
I've never had trouble with Microsoft's Security Essentials or Defender, but some other antivirus may block things they shouldn't.
Also make sure you only get the Game Manager from Big Fish. Their link seems to be
***here*** but you can also go to
http://www.bigfishgames.com/ click the link for "Help" and do a search for Game Manager to find the link yourself. If you get the Game Manager from some other site, it might have unwanted "something added" that an antivirus might be blocking.