If you download software from the Internet, it is possible that the downloads have been tampered with by someone malicious. Very unlikely, but it is possible. Every once in a while, I hear a news report about some site being hacked, and the software on the site is now suspected of being tampered with.
Well, there are ways you can check the integrity of your downloads, and it is a good idea to do so. For people who are security conscious, it is common to do. Here are some articles about it:
http://searchsecurity.techtarget.com/tip/How-to-detect-software-tampering
http://lifehacker.com/247262/how-to-use-md5-sums-to-verify-downloaded-files
What to do:
a) If you buy and download software over the Internet, ask your software vendor how to verify the integrity of the download.
b) For geeks: Read about how MD5 can help you verify your software downloads.
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