I can't update the version from 1.7.4 to 1.7.7 the installer only offers select "Install"
I don't remember there ever being a version 1.7 of JIRA, it went to version 2 quite quickly. There weren't installers for it around those versions either.
I'm afraid I suspect you're talking about something other than JIRA, but you haven't told us what.
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