Sorry to take so long to reply... instead of trying to troubleshoot what wasn't working (most likely disabled HTTP/web service), I just set up new PC.
Scan and connection now works fine, under Win 10, but have a new issue...!
I have two PCs, both run and update my BitFlock nest fine. But each time I run BitFlock on one PC, it no only updates my nest but removes the other PC details. So the nest only ever shows one PC at a time.
Is this normal? I thought - maybe mistakenly - each PC I run BitFlock on would update and add, not replace, to my nest's computer list and be able to see multiple computers' HDDs at once.