Because 6.2.0603 is an older version designed for legacy Windows systems (like Windows XP and Vista), you might consider modern, free alternatives for video conversion:
Version 6.2.0603 allows you to embed external subtitle files directly into the converted 3GP video. Understanding the Licensing Model allok video to 3gp converter 6.2.0603 license name and code
But Allok 6.2.0603 was offline software. It didn't need to phone home. Because 6
If purchasing the software is not feasible, consider: you might consider modern