Hi Nala1977,
A maintenance license is also a perpetual license. Its expiry date determines the latest version of Terragen you can run. Even though your maintenance expired on 3 Jan 2024, Terragen will still run.
There are a number of ways to locate your license key file. If you're able to run Terragen, there is a "Reveal license key" option under the Help menu. This will open up a window to the folder containing your license key file.
If you log into your online account, you'll find links to your license key file and software under the
original purchase transaction's "View Details and Downloads" link.
If you're interested in the new pricing tiers, please contact us at
support@planetside.co.uk where we can determine the best way to help you out.