Thank you, Nemo (bis). Patience aside, I wake to find that I was too sleepy and put my comment in the wrong place; somebody else has kindly moved my comment where it belongs.
I infer that Checklinks isn't copyleft. This makes it curiously reminiscent of Xenu's Link Sleuth, freeware but not free software (and thus only available for MS Windows), and, years after my departure from MS Windows, one of only a tiny number of aspects of MS Windows that I miss. -- Hoary (talk) 00:01, 3 July 2014 (UTC)