Quote:
Originally Posted by CarolSEL
Aren't the older versions automatically overwritten with upgrades? 
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Yes and no.
Forums are typically installed in a folder i.e. on many sites you see /forum/ or /forums/. So with that being said when you upgrade then of course the files are overwritten BUT that does not include older outdated files, so if an older vBulletin file still existed and is no longer used in the newer verison then you would still have an old file present. Furthermore any "extra/spare/old/outdated/backup" copies of the software are never updated unless you do two manual upgrades.