Thanks Meter 111
Join Date: Nov 2010
Location: Franklin County MA
as stated, it's used to check the integrity of the file to be sure none of the packets got corrupted or any other reason that would corrupt the download.
I wanted to add that you can also use 7zip (def look it up if you don't have it) to "test archive" and it will actually check the zip file itself to make sure the file is not invalid. (this way you can be sure a zip is good even if the dev doesn't post a md5 sum).
there are also sha1 sums, but md5 is the most popular that you'll usually find.
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