I downloaded Microsoft Office 2010 Technical Preview (14.0.4006.1000), (O2010_SingleImage_retail_ship_x64_en-us),back in 2009 but can not find my product key nor do I remember where I purchases this from, is there anyway to get another product key and
what version is this build?
Technical Preview is usually a term used for the downloadable unfinished test version, and they are free.
such releases are usually time-bombed trials, so it's most likely that even if you still could get it, it would be beyond the trial period by now.
you can download a trial version of the final production (current) release, and buy a license for it, at office.microsoft.com/try