I would simply use the command line. Navigate to the folder with all
*.ts-files to be concatenated and then run the...
copy /b *.ts output-file.ts
...command, which takes all
*.ts-files in the current directory and concatenates them to a resulting file called
output-file.ts. The command might run for several minutes, so don't worry, you can grab a cup of coffee now ;)
*.ts-format - "Transport Stream" - is a streaming format, it is possible to easily just "add one file after another" without damaging the data inside)