The update has not updated; I downloaded the whole rather as instructed, and it won't work. Now what?

I'm looking for advice: I wanted to update firefox - updates (he describes himself as 'security') has failed. I looked on this website for advice. He said to download the whole version. I did it and the file will not work. I can't update the browser or load a new version.
That raises red flags in my brain (rightly or wrongly). I know all sorts of things I could try, but having had security problems recently, I would appreciate guidance / wisdom on the matter. I maybe paranoid, but it seems that something is wrong.
The old version of my browser works ok for now.
Help, please.

Try this:

If you keep problems, disable your anti-virus temporarily.

Tags: Firefox

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