Emma Richardson has tested the latest Sharing Cart 3.2, release 1 version in Moodle 3.3, and reports that it works fine.
Please go here to download from the Plugins Database: https://moodle.org/plugins/block_sharing_cart
Sorry, until recently, we have not learned how to make automatic notification of upgrades, but thanks to some coaching by Alex Bias, we hope to do so in the next future upgrade. And a reminder, please vote here if you want the Sharing Cart to become a standard block >>
MDL-19721 (Put Sharing Cart into core).