If you are using Neware BTS4000 or IGBT testers which produced before year 2016, the best appropriate software for your testers would be BTS7.5.4, release on September 10th, 2014. Please download the BTS7.5.4 stable English version from here: NEWARE_BTS_7.5.4_2014_09_10EN.exe Of course, the newest BTS7.6.0(here) or higher version also works for your testers, but there’s no necessary for you to upgrade to the