Hello,
1. To change the size of the product images go to WooCommerce > Settings > Product > Display > Image settings and don’t forget to regenerate thumbnails after changes(use Regenerate thumbnails plugin). Read more about image sizes – https://docs.woocommerce.com/document/fixing-blurry-product-images/
2. Please, try to update your theme to version 4.12 manually via FTP https://www.8theme.com/documentation/xstore/theme-installation/theme-update/
Let us know if you need any further assistance.
Regards