Hi Peter,
If you want to update, you might need to swap back to the parent theme, then update, and switch back again.
It won’t update your child theme, so the customisations will be kept.
You may however need to update the license details at the top of the child theme css file (we changed this). It should be:
/* LICENSE & DETAILS
==================================================
Theme Name: Flexform Child Theme
Theme URI: http://flexform.swiftideas.net
Description: A Retina Responsive Multi-Purpose WordPress Theme - Designed & Developed by Swift Ideas ( www.swiftideas.net )
License: GNU General Public License version 3.0
License URI: http://www.gnu.org/licenses/gpl-3.0.html
Template: flexform
Version: 1.0
Author: Swift Ideas
Author URI: www.swiftideas.net
All files, unless otherwise stated, are released under the GNU General Public License
version 3.0 (http://www.gnu.org/licenses/gpl-3.0.html)
==================================================
*/
– Ed