Auctionawy 10.00 is available for online download from your "My Account". This version only has support for the New Auctionawy modules Feeder and Affiliate, if you are not planning to buy these modules no need to upgrade now but anyway next upgrades will depend on this. If you upgrade this will not change anything in your database or customizations.
To upgrade, only upgrade the cgi files under cgi-bin/auction only, do ot upgrade anything under the data directory.