I have been trying for a few days now and never had this issue before. But since 5.2 i have been unable to open the client.
I open the client-4.2.jnpl.
WOL logo pop ups.
Then just get the pop up box
"Starting Application"
"Downloading Application"
Name: World of Logs Client (4.2)
Publisher: Digibites Technology
From: http://media.worldoflogs.com

The progress bar gets to about 40% and then does nothing, i have even left it for a few hours - i have even tried redownloading it from the website and it keeps getting stuck in the same position.
Thanks for any help!