myTVDBupdater.exe will update your existing myTV database to include filesizes. Whilst no harm should be done by running this utility, please backup your database beforehand or risk losing all of your data.
This utility is a quickfix to allow the myTVDB2XML tool (and the myTV Collection website) to correctly report space usage. If you do not use myTV Collection there is no need to download and run this application.
This information [filesizes] will be automatically included in the next myTV build.