If you have purchased any version of WM Lab application then you can upgrade it to latest version with no cost. Code canyon offers two different types of license:

Regular License : You can use this license only at one location. You can not even install the application with the same license at another location. In case you want to install it into another location, you have to release license from existing location as shown in attached image:

Once you release license, you won't be able to use it in that location & you will be able to install the application at another location.

Extended License : You can use the application at multiple locations by using same purchase license.