When I change the configurable options in the drop down menu, it changes only price. But it doesn't change such as sku, description, additional info of associated simple products. It was worked well before. I think it happens after I upgraded magento into 184.108.40.206 . please help me about this issue. please check this link and change the configurable option ( size ), then you can see only change price. But it doesn't show actual simple's details such as sku, description. https://www.bestdeals4ever.com/double-wind-spinner.html thanks
What you're asking is not the default behaviour of Magento. It will not load a simple products description etc if this is selected using the product options.
To do what you're needing you would need to use an extension such as Simple Configurable Products. The github for which is available here:https://github.com/organicinternet/magento-configurable-simple