In 2020.2.1 you can not get the latest version of a asset store asset from the package manager. It says its on latest version but this is not true. You are on the old version. So you need to delete the unitypackage from
AppData\Roaming\Unity\Asset Store-5.x
And download to get latest version
You can work around this bug like I described here: https://discussions.unity.com/t/819423/18
The bug report case number is 1298335