So i got an update on the Curse.CurseClient.Common.dll file. It works for the latest version of Curse Client.
*This will allow you to download every addon update at the same time*
How to:
1.- Open up curse client
2.- Open task mannager
3.- Select Curse Client
4.- Right click - go to process
5.- Right click on CurseClient.exe - Go to the file directory
6.- Close Curse Client
7.- Replace Curse.CurseClient.Common.dll with the one on the download link.
8.- ENJOY
DOWNLOAD HERE
THIS WORKS, its UPDATED for 4.0.1.260 version