Well the updates are working fine from our end .
In your site there may be third party plugin or your webhost issue or you have added some code to disable the updates .
Also the ftp's sent by you are not working for us . I tested it from two systems .
As i mentioned in previous reply you have to deactivate the theme and then delete plugin from then wp-admin -> plugins which are not udpated to latest and again install them.
Download a fresh copy of theme using themeforst account .You willl find the plugin in your wplms package -> wplms.zip -> plugins folder .
If possible please also manually update the theme again .
refer :
https://wplms.io/support/knowledge-base/manually-updating-wplms/
.