I have followed these two steps -
1. Create a new theme folder for your Twenty Eleven child theme. For this example, the child theme is called BP Twenty Eleven so we’ll name our theme folder bp-twentyeleven.
2. Create a style.css file and add it in the bp-twentyeleven folder with content below:
(copying the suggested content for style.css)
3. Upload the bp-twentyeleven folder with the style.css file within to your server at /wp-content/themes/
NB My installation is on stand alone PC not connected to the internet.
When I attempt the start of the Compatibility Process and click on “update your existing wordpress theme I get the following error:
An unexpected HTTP error occurred during the API request – Try Again
I cant progress beyond this point.