There are many possible causes for failure. If you want to see what the error is, you should run patch.exe and IGCConfig.exe from inside a DOS prompt (then it won't go away when the execution halts.)
Make sure that:
1) You really unzipped the IGC into the correct folder!
2) There are no write-protected files in your EU folder and sub-folders.
Make sure that:
1) You really unzipped the IGC into the correct folder!
2) There are no write-protected files in your EU folder and sub-folders.