SafeGuard: How to apply a Windows installer patch to a SafeGuard product

Issue
How to apply a Windows installer patch (.msp file) to a SafeGuard Product.

Sophos product and version
All SafeGuard products

What to do

Scenario 1 - The Windows Installer package (.msi file) that should be patched is already installed.

Do one of the following:

• Option 1 (manual installation)
  Double-click the .msp file
• Option 2 (automated installation / deployment)
  Run msiexec /p <path to patch.msp>

Scenario 2 – The Windows Installer package (.msi file) that should be patched is not installed yet (e.g. fresh installation of software).

1. Run an administrative installation of the original .msi file with the parameter /a
   This will extract the contents of the .msi file into a given folder (for example, c:\extracted)
   msiexec /a <path to msifile.msi>
2. Run msiexec /p < path to patchfile.msp> /a <path to previously extracted *.msi package>
   msiexec /p c:\patch.msp /a c:\extracted\Client.msi
   This command will slipstream the patch into installation source which can be used for deployment.
3. Run the extracted msi file to start the installation of the patched installation source
   msiexec /i c:\extracted\Client.msi