Hi Fred,
1) Depends what customizations. If you only added custom CSS in the theme options, you can even de-activate, remove, then install the new version, as those settings will be preserved.
2) You can add an Extra Class to a page, then add custom CSS to style it. Say we add the extra class “mycustombg1” (no quotes) and we have already uploaded an image in WP, to use as a background:
.mycustombg1 {
background: url("http://example.com/wp-content/uploads/2013/07/myimage.jpg") 0 0 no-repeat #FFF !important;
}
Hope this helps.
Regards,
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Cosmin
Support Assistant
.