Need help to upgrade latest Seamonkey

[jprincic]

There's a message in SM advising I update to the latest V2.49.5
I downloaded the appropriate version (Linux x64 British English) and extracted 
the files. I see one named updater but clicking on it does nothing.
I can't find newbie instructions and seek some guidance.
My distro is MX-18.3_x64 Continuum.
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