Could not download an installer extension

Hi,
I have a Macbook pro with retina display. I restarted it today and now all the programs i downloaded since i got the Mac are all gone. (vlc media player/utorrent). I tried installing them again but it keeps giving me an error could not download an installer extension. My firewall is already disabled and my settings are on "allow apps downloaded from anywhere". I do not have any VPN software and have verified and cleared my hard disk. I don't have any apple support where i am . Help Please !!

Well, you have turned off most of the protection on your Mac and you are downloading carpware from utorrents, now you wondering why things are disappearing. It sounds like you are getting just about what you should expect there.
Please download and install EtreCheck from http://www.etresoft.com/etrecheck
Run it and post the report here.
Maybe we can help you to cleanup some of the damage you have done so far.

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Could not download an installer extension

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