Step 1:
- Allow Warcraft III to use local files:
1) Open the 'Windows Run dialog box' by pressing the Windows + R keys (Windows keyboard) or Command + R keys (Mac keyboard)
2) In the dialog box, type Regedit and click OK
3) Go for location 'HKEY_CURRENT_USER' -> 'SOFTWARE' -> 'Blizzard Entertainment' -> 'Warcraft III'
4) Double click on 'Allow Local Files' and change the parameter to 1
Step 2:
- Download FILE from the reply (link) and extract it into Warcraft III folder