I've d/l'ed the WSUS Offline software and started to to run it and got the following on my Win 7 Ultimate x(64) box. Software resides on the (D:) drive which has 57GB of free space -- any suggestions?

09/07/2016 20:05:55.87 - Info: Starting WSUS Offline Update download (v. 10.7.3) for w61-x64 glb
09/07/2016 20:05:55.87 - Info: Option /includedotnet detected
09/07/2016 20:05:55.88 - Info: Option /verify detected
09/07/2016 20:05:55.89 - Info: Option /exitonerror detected
09/07/2016 20:05:55.96 - Info: Set time zone to LOC4:00
2016-09-07 20:05:56 URL:http://download.wsusoffline.net/StaticDownloadFiles-modified.txt [345/345] -> "../static/StaticDownloadFiles-modified.txt" [1]
2016-09-07 20:05:57 URL:http://download.wsusoffline.net/StaticUpdateFiles-modified.txt [124/124] -> "../client/static/StaticUpdateFiles-modified.txt" [1]
09/07/2016 20:05:58.25 - Info: Updated static download and update definitions
09/07/2016 20:06:00.10 - Info: Downloaded/validated mkisofs tool
09/07/2016 20:06:00.27 - Info: Downloaded Sysinternals' tools Autologon, Sigcheck and Streams
09/07/2016 20:06:25.72 - Info: Downloaded/validated most recent Windows Update catalog file
09/07/2016 20:06:25.72 - Warning: Deleted unsigned file "D:\My Documents\Downloads\WSUS\wsusoffline\client\wsus\wsusscn2.cab"
09/07/2016 20:06:26.54 - Error: Catalog file ..\client\wsus\wsusscn2.cab signature verification failure

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I don't buy computers, I build them!!

When in question, it probably helps to go to the forums of the people who make or support the software:

http://forums.wsusoffline.net/viewtopic.php?f=3&t=925&sid=ce1444f719a94f93bb6e393a3f0f2d51

It suggests either not using verification or updating your local root certificates, which also come in the form of Windows Updates.