Well, if everybody agreed it wouldn't be any funny You might have seen the recent KB3189866 thread/s, where people couldn't see the filesize, and then got stuck at whatever "Downloaded %", and had no clue what had happened?. Wumt users, no problema!
I found that where Windows Update client on a brand new installation of Windows 7 Enterprise with SP1 never completed scanning after waiting for 7 hours, the WU MiniTool completed and it was actually quick. Maybe the fact that I selected the superseded updates in addition to the regular ones to have made a difference.
Actually it's stuck for me in both cases. Wumt or regular client. Only way to fix - manual download and dism.
Welcome to MDL for me, both WU and WUMT are stuck in searching without latest WU client from kb3172605