Hey @Kev,
Yes, there are many comments but there are many users with working sliders as well. The key here is testing in staging before updating the live site. That is the best practice for doing any website updates.
To th Slider Revolution issue, you need to switch to the SR 7 engine before updating to the latest version. We do not have notification for that as Slider Revolution is not our product. We have no control over it nor can monitor system changes. If you wish to receive bundled plugin news, you need to purchase the plugin and subscribe to the plugin author’s newsletter.
We cannot downgrade Slider Revolution. It would be best that you contact your web host to revert to the previous working version of your site. From there, you can set up a staging copy and test converting your sliders to SR 7 system.
About the Classic Slider Revolution element issue. Please note that we strongly encourage to switch to v2 or non-Classic elements. That includes Slider Revolution. Just copy the Slider Revolution shortcode to a Raw Element.