You only need files here that are newer than the files you currently have. Just copy the newer unzipped files over the previous versions. Convert.bat may have been updated so be sure to use the latest version. You may not need the latest version of TeX Converter.ini but if you do then you will need to: either update the program paths using Help / Program Locations or retype the paths in TeX Converter.ini or copy and paste the paths from a copy of the old version.