You really haven't searched hard, have you...a simple Google will tell you David Bowden is the author of Safety in the Markets.
They sell DVD courses, not EXACTLY online but very close.
http://safetyinthemarket.com.au/product/master-forecasting-course/
They will set you back $9995 though, but wait..
Note: Students must own the Ultimate Gann Course before purchasing the Master Forecasting Course as this course builds on the lessons covered in the Ultimate Gann Course.
Hmmm, Ultimate Gann Course,
http://safetyinthemarket.com.au/product/ultimate-gann-course/ is $6995. So be prepared to shell out $17k
:
But before you do that, do check out
http://asic.gov.au/about-asic/media-centre/key-matters/safety-in-the-market/ and if you still wish to look for David Bowden courses after that, then you're on your own.