The reason of original LAP-C series software V3.04.01 had bugs even the upgrade version V3.05, we ZEROPLUS apologize to have this serious problem and in the mean time we upgrade the new version V3.06 .After the test ,all the problems and bugs have been solved. Please down load this new version V3.06 to instead of original V3.04.01 and V3.05 . All the V3.04.01 and V3.05 will be removed .Thanks for your choosing ZEROPLUS logic analyzer and thanks for your forgiving to cause your inconvenient. LAP-C series download