How to Rollback MQ patching done on windows - ibm-mq

Question

Could you please help on how to roll back the MQ patch applied on windows.
I have patched the system from MQ7.1.0.0 to MQ7.1.0.8. It is a MQ client.
Plz suggest how to rollback to 7.1.0.0.
dspmqver -i
Name: WebSphere MQ
Version: 7.1.0.8
Level: p710-008-161121
BuildType: IKAP - (Production)
Platform: WebSphere MQ for Windows
Mode: 32-bit
O/S: Windows Server 2008 R2 Server Enterprise Edition, Build 7601: SP1
InstName: Installation1
InstDesc:
InstPath: C:\Program Files (x86)\IBM\WebSphere MQ
DataPath: C:\Program Files (x86)\IBM\WebSphere MQ
Primary: Yes
MaxCmdLevel: 711
Name: WebSphere MQ
Version: 7.1.0.0
InstName: Installation2
InstDesc:
InstPath: C:\Program Files (x86)\IBM\WebSphere MQ_1
Primary: No
After executing the below command
C:\Program Files (x86)\IBM\WebSphere MQ\bin>dspmqver -i
Name: WebSphere MQ
Version: 7.1.0.8
Level: p710-008-161121
BuildType: IKAP - (Production)
Platform: WebSphere MQ for Windows
Mode: 32-bit
O/S: Windows Server 2008 R2 Server Enterprise Edition, Build 7601: SP1
InstName: Installation1
InstDesc: InstPath: C:\Program Files (x86)\IBM\WebSphere MQ
DataPath: C:\Program Files (x86)\IBM\WebSphere MQ
Primary: No
MaxCmdLevel: 711
Name: WebSphere MQ
Version: 7.1.0.0
InstName: Installation2
InstDesc:
InstPath: C:\Program Files (x86)\IBM\WebSphere MQ_1
Primary: Yes

Answer 1

The client software is distributed as a full install not a patch. In your case the roll back would consist of a uninstall of the 7.1.0.8 client package and a reinstall of 7.1.0.0 client package.
Download links for each v7.1.0.x client package are located on the IBM page "MQC71: WebSphere MQ V7.1 Clients".
NOTE that v7.1 of IBM MQ went out of support on April 30th 2017. Newer versions of IBM MQ client can connect to IBM MQ Queue Managers that are at a older version.
You have two installations on the same server, Installation1 is 7.1.0.8 and Installation2 is 7.1.0.0. Because of the order of the installations, you probably upgraded Installation1 from 7.1.0.0 to 7.1.0.8 and the later installed 7.1.0.0 as Installation2.
This is possible because MQ v7.1 and higher supports multiple versions being installed in parallel. On Windows one installation will always be primary, in the original output you provided your Installation1 at 7.1.0.8 was primary.
You can run the command below to switch the primary install to Installation2 (your 7.1.0.0 installation).
setmqinst -i -n Installation2
The updated output you provided shows that Installation2 at 7.1.0.0 is primary now.
You can consider this as rolled back to 7.1.0.0 since the installation with that version is now the Primary installation. You could take it a step further and actually uninstall the 7.1.0.8 installation if you like or you could keep it in place to "roll forward" to in the future.