Yes, you can transfer a Snagit to a secondary computer using the same license key as long as you are the same user, and the software is not in use on both machines at the same time. Snagit is a per user based software, which means one user may install and use one copy of the software product on a single computer at a time and only by one user at a time.
If you wish to upgrade to the latest version - Snagit v10, you may place your order here: Upgrade to Snagit version 10.0
If you wish to upgrade to the latest version - Snagit v10, you may place your order here: Upgrade to Snagit version 10.0