I did send a message to Philip Bennifall about Bgt since as the originator of the code he should be able to get it unflagged, but I'm not sure if he ever did something about the problem.
its really a shame and most inconvenient, since whichever way you cut it Bgt has been used to make some exceptional things over the years.
As for turning off Windows Defender, I wouldn't personally like to do that owing to the need to always have an antivirus active or risk lots of nasty things happening to your Pc.
I can say Windows defender is a huge improvement over other antiviruses I've tried, both in terms of respecting exceptions and in terms of screen reader access, as well as playing nice with other programs, although I'll be the first to admit I haven't made an exhaustive study of all the antiviruses out there, I'm happy to go with whatever works, which at tbhe moment for me is a combination of Windows defender, Malware bites and Cleaner for system repairs.
With our dreaming and singing, Ceaseless and sorrowless we! The glory about us clinging Of the glorious futures we see,
Our souls with high music ringing; O men! It must ever be
That we dwell in our dreaming and singing, A little apart from ye. (Arthur O'Shaughnessy 1873.)