Seems like nobody can play webclient nor the client, so Goth has used his brilliant mind and tried something.
This will hopefully fix your Downloadable client problem.
Step 1: Go to your C:/
Step 2: Find "ForbiddenscapeV1.0"
Step 3: Click on that, then go to "CruelalityXV2.0"
Step 4: Extract that to your C:/ (Or C:\)
Step 5: Run the Run.bat on the client, and it should work.