We purchased WPLMS Batches on the 3rd Feb, and just noticed that when updating our WPLMS to 2.5.2 the batches plugin fails with '<span style="background-color: #fbeaea; color: #32373c; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif; font-size: 13px;">Update Failed: Download failed. Unauthorized'</span>
Please make sure you have added the correct license key in the batches plugin and activated the plugin.
Also try updating the theme and plugin from the wp-admin->updates section.