SCCM Fails to download updates

Question

I was starting to post this as a question but I just got it working.  The updates for my SCCM install were failing to download. 
I found the log sample below from the patchdownloader.log
Log Sample Start:
HttpSendRequest failed HTTP_STATUS_NOT_FOUND  $$<Software Updates Patch Downloader><Fri Aug 08 11:45:44.690 2008 Eastern Daylight Time><thread=2292 (0x8F4)>
Download http://www.download.windowsupdate.com/msdownload/update/v3-19990518/cabpool/exchange2003-kb931978-x86-chs_df730b4a221003767fd252d7ab255825055adc7f.exe to C:\TEMP\CAB412.tmp returns 404  $$<Software Updates Patch Downloader><Fri Aug 08 11:45:44.690 2008 Eastern Daylight Time><thread=2292 (0x8F4)>
ERROR: DownloadContentFiles() failed with hr=0x80070194  $$<Software Updates Patch Downloader><Fri Aug 08 11:45:44.690 2008 Eastern Daylight Time><thread=5096 (0x13E8)>
After validating WSUS was working and the ability to download the updates outside of the wizardI ended up going back to my most recent packages
Repointed my download location from internet on a new test package/update list to a pointless network location a couple of times, repointed to the internet and I got a partial download
I deleted and recreated one package and modified its package source share path. I am not sure how unique that path has to be per deployment package but I made the path definitely unique to this package. Once that Deployment Package was recreated my downloads appeared to work correctly. 
I also did not know that the initial download is processed through the system variable temp directoy on the site server

Answer 1

While downloading new Software Update Group, I was also facing same errors in SCCM 2012 SP1. How it was resolved or a work around was applied is by segregating the updates released in each month.
Errors:
"HttpSendRequest failed HTTP_STATUS_NOT_FOUND"
"Download http://wsus.ds.download.windowsupdate.com/c/msdownload/update/software/secu/2014/07/windows6.1-kb2918614-ia64_ea0909c226c16fa4217e673486fccba109a3e529.cab to C:\Users\Admin\AppData\Local\Temp\CAB209E.tmp returns 404"
"ERROR: DownloadContentFiles() failed with hr=0x80070194"
Initially, it seemed to be related to proxy configuration on SUP or WSUS level but after bypassing proxy and configuring direct routes to Internet - the error was still there.
This was actually related to some specific Security Updates for Itanium-based processors. Downloading such updates released during July and August, 2014 only, were faced with errors.
However, the x64 versions of these failing updates got downloaded successfully.
Probably the failing packages were moved or renamed on mentioned website, due to which patch download was giving errors.
The above has worked for my environment, best of luck for yours. 
Kindly "Vote as Helpful" or "Mark as Answer" - if it helps. [Sanaullah Mir, MCTS Exchange & Lync]