Hi manish14
Welcome to BlackBerry Support Forums
If you're having problem with the recent version of BlackBerry World , then Download BlackBerry World version 4.0.0.55 which is the best Workaround now available for BlackBerry World , first uninstall any existing version of BlackBerry World from your device, from Options > Device > Application Management > Locate and delete BlackBerry World , then perform a Battery pull restart by removing the battery while your device is Powered On.
After device reboots from your BlackBerry Browser browse to or click here http://mobileapps.blackberry.com/devicesoftware/entry.do?code=appworld3 to download version 4.0.0.55 . In addition check this Knowledge Base for further help :
KB29422 BlackBerry App World icon is missing after upgrading to BlackBerry App World 4.0.0.63 to 4.0.0.65.
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