This one doesn't work - everything seems to be fine, but at a later time, when I open the model (second or third time...), I'm able to delete all the guides, although Fredo Guides report them (and show them) as being locked.
Tried and tested in SU 2022, 2023, and 2024.!
This extension is one and only, but until it is fixed I'm using EA Locked Guide, which works pretty well, but is infinitely simpler than Fredo Guides.