Can't open Zoho Workdrive Application on my Mac

Can't open Zoho Workdrive Application on my Mac

I had installed Worksdrive for Mac.
Synced one folder succesfully on my Mac.

Then transfered a large volume of data from Dropbox to WorkDrive, which is working perfectly in my browser.

Now I can't restart my WorkDrive Desktop app anymore and ad the syncing of the new folders and files.
Nothing happens. There's even no error message.

As I don't have access to my files in Fropbox anymore, the WorkDrive application became critical.
Please respond quickly.

Thanks,
Luc