That's not always easy, though: with many VHS to DVD converters, you'll have to search the user manual for a URL or, in the last resort, email the manufacturer. But nowadays, most laptops don't come with disc drives, so you should be able to download it from the web too.
This software is normally supplied on CD-ROM. With pricier devices, this software often includes editing and DVD burning tools as well. VHS to DVD converters are normally bundled with software that allow you to use them. ASUS ZenDrive DVD writer (Silver) at Amazon for $34.99.