GUI Euchre for Windows is still available. I haven't done much work on it lately, but the latest version can be found here: bit.ly/GUIEuchre
The latest version is pretty stable. There are many options, great statistics keeping, auto updating. and few known issues. The issues that exist have been fixed, I just need to upload the latest version.
As always, if you find any additional issues, please let me know. Contact information can be found in the "Help" menu within the program.