No need to restart. But the operation was left at 99.9%.. Maybe that doesn't matter.
Microsoft Windows [Version 6.3.9600]
(c) 2013 Microsoft Corporation. All rights reserved.
Clink v0.4.9 [git:2fd2c2] Copyright (c) 2012-2016 Martin Ridgers
Clink
C:\Windows\system32>cd /d c:\windows\temp
c:\Windows\Temp>expand Windows8.1-KB2934018-x64.msu -f:* C:\windows\temp
Microsoft (R) File Expansion Utility Version 6.3.9600.17415
Copyright (c) Microsoft Corporation. All rights reserved.
Adding C:\windows\temp\WSUSSCAN.cab to Extraction Queue
Adding C:\windows\temp\Windows8.1-KB2934018-x64.cab to Extraction Queue
Adding C:\windows\temp\Windows8.1-KB2934018-x64-pkgProperties.txt to Extraction
Queue
Adding C:\windows\temp\Windows8.1-KB2934018-x64.xml to Extraction Queue
Expanding Files ....
Expanding Files Complete ...
4 files total.
c:\Windows\Temp>DISM.exe /Online /Add-Package /PackagePath:C:\windows\temp\Windo
ws8.1-KB2934018-x64.cab
Deployment Image Servicing and Management tool
Version: 6.3.9600.19408
Image Version: 6.3.9600.19397
Processing 1 of 1 - Adding package Package_for_KB2934018~31bf3856ad364e35~amd64~
~6.3.1.5
[===========================99.9%========================= ]
The operation completed successfully.
c:\Windows\Temp>