I downloaded Firefox 4 for my Mac running MacOS 10.4.11 and replaced my older version (because I didn't understand the meaning of the barred circle) and now cannot use Firefox at all. How do I get the older version back?

When I try to open FF4 I get the message it can't be opened because it is not supported on my architecture. I can't believe no-one else has had this problem. You must have a lot of internet duffers who don't really know what they're doing. I need to get my old version of FF back if I'm going to run it on my computer. I don't understand why an app as widely used as this doesn't have a pre-app that assesses whether one has the architecture to run a new version. You advertisement merely said OS 10, and "all systems". It did not specify a newer MacOS than my 10.4.11. Now I seem to be out of luck and will just use Safari.

Firefox 4 requires at least OS X 10.5 and an Intel Mac. There is a third party version of Firefox 4 that runs on OS X 10.4/10.5 and PPC Macs, for details see http://www.floodgap.com/software/tenfourfox
If you prefer, you can get the latest version of Firefox 3.6 from http://www.mozilla.com/en-US/firefox/all-older.html

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