firefox install of older version, help please?

Keith S

HI, I wanted to install a slightly older version of firefox and went to the directory pub URL and found the version I wanted to download.
I clicked on the 64 bit version of windows firefox and saved it to my computer.
Unzipped it into it's own folder and then tried to find the setup or install .exe file.
None seems to be there.
Any suggestions?

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