Adding seats to your account is a cost effective way to obtain more licenses of DEM earth.
Adding a seat to an existing account costs less than half  the price of a new license.

You can add a new machine to an existing account from here..

TIP :  This works well for you in combination with a floating license..


Use your DEM Earth license at home and work, without having to de/re-register. 

For this to work, you need a floating license, and at least one additional seat. 

Your DEM Earth account can contain as Many additional ID's as it has additional seats.