To upgrade your current ARCHLine.XP LT license to the most recent version of ARCHLine.XP LT, follow these steps:

When you purchase the new version of ARCHLine.XP LT (upgrade) you can download and install the new version of ARCHLine.XP LT, activate the license, and begin using the new version of ARCHLine.XP LT.
After you activate the new version, your old ARCHLine.XP LT license stops working in 30 days.