Checking for Updates Stuck in Windows 8.1

Also, in "Control Panel\All Control Panel Items\Troubleshooting\Fix problems with Windows Update", received this after scanning:
"windows update error 0x80070490" ...... fixed (actually it's not fixed)

After searching for solutions online for a while, there is a simply fix for this problem. Use the link below, download and install KB3172614:
http://www.catalog.update.microsoft.com/Search.aspx?q=3172614

By the way, these solutions are useless to me:

• WSUS Offline
• WindowsUpdateDiagnostic.diagcab
• sfc /scannow
• Delete "SoftwareDistribution"
• ....

Update:
KB3172614 may get stuck just like the Windows Update does.
I tried several more computers with this problem. Though I solved all of them, it seems I have to use these solutions as a combination. Here are the solutions, and no more than these :)

• use "Fix problems with Windows Update" in Control Panel
• download and run "WindowsUpdateDiagnostic.diagcab"
• delete everything in "SoftwareDistribution" folder in C:\Windows\   
• use "Disk Cleanup" for C:\ and then, click "Clean up system files"   (this may take long)
• install KB3172614  

Try the first 4 solutions again and again in different orders until you can install KB3172614 smoothly. And better install it when the "SoftwareDistribution" folder is empty.