This article explains the various states license can be in.
A supported license is covered with support & upgrades contract entitling you to the latest tool versions, bug fixes, platform support, new features and technical support.
An expired license means that the support & upgrades contract has expired but the license belongs to you so you can still continue to use it indefinitely.
If your license has expired you are only entitled to the version you purchased and the minor versions up to the next major version. E.g. If you purchase a license for SQL Compare 14 and it expires, you are entitled to 14, 14.1, 14.2 etc up to the last minor version of v14 but not v15.
Once a license expires you are no longer entitled to help with technical questions but we're happy to help with licensing and customer portal questions although you may experience a delay in reply time.
If you are evaluating a Redgate tool you will be given a trial key which gives you full tool use and automatically expires after 14 days.
When you upgrade to a new major tool version a trial warning message is displayed so that the licensing server can check that your license is entitled to the upgrade. You will need to activate your license key or log in with your Redgate ID to move back into licensed mode.
If you have a license that shows in the customer portal as never supported, it's a very old license that was purchased without support & upgrades. All new licenses now come with support & upgrades when you purchase.
You can find more information on Support & Upgrades here.