If you want to install QuickLook on more than 1 PC these scripting-topics might be relevant:

• Change Install-Directory (Ref: #1056)
• Activate "Run at Startup" (Ref: #1039)
• Deploy plugins (Ref: #1053)

Currently the default path for installing QuickLook is the user's %APPDATA%-directory. To change the path and install QuickLook for all users use this command: msiexec /i "msi_path" INSTALLFOLDER="C:\MyFolderPath" ALLUSERS=1 /qb

Create a shortcut for each user in %APPDATA%\Microsoft\Windows\Start Menu\Programs\Startup\ named QuickLook.lnk pointing to path\to\QL\QuickLook.exe /autorun

Another solution would be to use %ProgramData%\Microsoft\Windows\Start Menu\Programs\Startup\QuickLook.lnk although this currently has a drawback. Users don't see the checkmark in the trayicon and could enable QuickLook a second time. This would lead to a message saying "QuickLook is already running".

.qlplugin-files are just zip-files that have been renamed. Unzipping these files into the QuickLook.Plugin-directory inside the install-directory is all that's needed.