problem with Grimoire

When I open Grimoire 3.3 it shows as a hidden icon only and doesn't open
I am sorry if this a stupid question or it if it has been answered before It has been a while since I played the game

If you have the newest of Grimoire 3.3; when you open it up there should be an option for New Version or Test Version. I think that the Test Version is for test servers, although I've never tried so don't quote me on that.

Have a look at this thread and make sure you download it again after reinstalling your current version.
https://www.mpgh.net/forum/showthread.php?t=1275846
This is the one I'm using and it works perfectly fine.

After downloading it, make sure to extract the .rar file onto your desktop to make it a folder.
Open the folder and play!