I just installed zen-cart. Now I need to install Google checkout module. Should I uninstall zen-cart and then reinstall with added googlecheckout module?
During installation I did not see which payment module is connected, so it makes me confused with the following question:
1. Check UPGRADE file.
IMPORTANT: Uninstall and re install the module. (which module, where and how?)

2.OPTION A:
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If you have the basic Zen Cart installation without any other modules or add-on's,...(I have no idea what kind of installation I have - basic or not. How to know? where "other modules or add-on's" are located?)

For your reference, here is the list of files you need to copy over to your system: (before main installation or after?)

3. Note: The folder YOUR_TEMPLATE refers to the folder that contains your templates. The folder YOUR_TEMPLATE in the package refers to the folder that contains your templates, you must put the files in /includes/templates/YOUR_TEMPLATE/ in your own templates dir there you should see the GC buy button. (Mama mia! Is there any other way to say it on human understandable language? What is it?) Souns like - I know that you know that I know...

Appreciated for help.