When offline installing yesterday’s 8.5 RC (updating from 8.2) it seemed to take about 4-5 minutes or more after clicking “install” before anything at all showed on the progress bar. (This just a retrospective estimate since I wasn’t clocking it and didn’t expect it to take so long.) After that it seemed to proceed as usual. Is this the expected behavior now, or is it symptomatic of something that needs attention?
I’m seeing slower installs on Windows as well from time to time. But there is no pattern in the behavior.