Hi richard,
Often when installing software you will need to use the actual mouse-
click as opposed to the default action mouse click. In VO, when you
use VO keys+space bar, this performs the "default action" for the
given item. In many cases this is a mouse-click and in other cases
it could be the Open command or some such animal. The actual mouse-
click is performed by VO keys+shift+space bar which will give you a
sort of click noise as you press the combination. In most cases when
the default action does not work this mouse-click will. In reference
to your question on progress indicators, that is dependent on the
specific installer application. some do, some don't give you
indications of their progress. I imagine that the Yahoo installer
did not because most installer apps that require the mouse-click do
not provide such feedback to VO.
Hope this helps.
Later...
Tim Kilburn
& Carter the Canine
Fort McMurray, AB Canada