Open Windows Control Panel then 'Regional and Language Options' and go to the Advanced property sheet. Change the selection in 'Language for non-Unicode programs' to 'English (United Kingdom)' and restart the machine when prompted. The next time you install the Kappris driver it will have A4 as the default paper size and A4 assigned to each tray. The text next to the combobox says 'This system setting...does apply to all users of this computer.'
Believe us, although it doesn't mention printer drivers specifically, this really is the control that makes the difference.
Windows 7 and Windows Server 2008 R2
The dialog looks a bit different, and getting to it is slightly different too. First, open the Control Panel from the Start menu.
- If your Control Panel view is set to 'View by Category' then click 'Clock, Language, and Region' | 'Region and Language'
- If your Control Panel view is set to 'View by Large Icons' or 'View by Small Icons' then just click on 'Region and Language'.
In the 'Region and Language' dialog go to the 'Administrative' tab and check that the 'Language for non-Unicode programs' is set to 'English (United Kingdom)'. Change it if you need to.
Once you've restarted your machine, navigate to the Kappris installation folder, typically C:\Program Files\kutana\kappris\driver and run KInstaller to reinstall the Kappris printer driver.
Note - on a Windows7 machine you need to be an Administrator to run KInstaller successfully. If you run it as a non-Admin user, KInstaller will fail, complaining that it can't copy KapprisPP DLL.
Further Note - if the Kappris printer queue has been set to Paused then although KInstaller will run, it will exit without doing anything.