I'm not sure how to find the fiesta directory. But I clicked on that link and the download isn't working for me. It gave me the option of running it and when I clicked on run it didn't do anything.
Step 1:) open cmd Step 2:) change dir to folder , eg type : " cd C:\Program Files (x86)\gamigo\FiestaOnlineNA"
step 3 : press enter
step 4: type " start FiestaRepairTool "(edited)