Hello,
1. The problem may be caused with permissions to “tmp” folder. You should ask your hosting provider about it. Also refer to these articles:
https://wordpress.org/support/topic/auto-upgrade-to-361-fails
http://forum.ait-pro.com/forums/topic/download-failed-could-not-open-handle-for-fopen-to-tmpwordpress-3-tmp/
Also we recommend to update theme via FTP https://www.8theme.com/demo/docs/idstore/index.html#!/upgrade
Please try this method.
2. You need update Revolution Slider plugin https://www.8theme.com/download-plugins/ .
3./4. Please update the theme and Woocommerce plugin and check products layout after that.
We can update the theme for you. Please provide us with FTP and WP Dashboard credentials in private content and create a back up of your site.
Best regards,
Jack Richardson.















