Will my Customizr child theme still work with Customizr Pro ?

Yes it will work fine. Customizr free and pro share the same core code and are fully compatible. You'll be able use the child theme that you were using with Customizr and all your previous customizations will work.

Once uploaded Customizr Pro, you simply need to change the parent theme name in your child theme stylesheet.

How to activate your previous Customizr child theme with Customizr Pro :

1. in your WP admin, navigate to Appearance > Themes.
2. Activate the Customizr-Pro theme
3. in your WP admin, navigate to Appearance > Editor
4. At Select theme to edit, select your Customizr Child theme by name in the dropdown list.
5. At the top of the code where it says “Template:” add “-pro” without the quotes, so this line now says Template: customizr-pro (instead of customizr). Note: customizr-pro must be written in lower case small letters.
6. in your WP admin, navigate to Appearance > Themes.
7. Activate your Customizr Child theme again