This message is returned by LCweb servers since, on October 1st 2023, the old updater files have been removed.
Please note these old codes have been discontinued in April 2022 in favor of a new (and better) system.
This also means you are running a very old plugin version and have to update it.
Please download the new version from the related Codecanyon page and re-upload it on your website, overriding the files.
Coming from such an old version, you must also register the product license to activate it in the new system.