It's some time ago that I did the workshops, but I cant remember having any problems with workshop 10 and the debugger workshop.

Most workshops have only one single script, so when you change that script and your changes have no effect when you run it, well that looks like a sort of miracle. But I rather think you either haven't changed the right things, or you haven't saved it, or you're editing a different script that you run. Should be easy to find out what it is. Check the file-to-run settings in SED. There are no miracles on a PC even if it sometimes lets you think so.

I believe watches were not supported by old versions, they only work from 6.40 on.