Use correct license key errors and codes

Author: dimodi

installation/license-key.md

@@ -63,7 +63,7 @@ The new license key includes information about all previous purchases. This proc
 
 ## Frequently Asked Questions
 
-#### Does the license key expire?
+### Does the license key expire?
 
 Yes, the license key expires at the end of your subscription:
 
@@ -79,7 +79,7 @@ You need to download and install a new license key after:
 
 An expired [perpetual license](https://www.telerik.com/purchase/faq/licensing-purchasing#licensing) key is valid for all Telerik UI for Blazor versions published before the license expiration date.
 
-#### Will Telerik UI for Blazor function with an expired license key?
+### Will Telerik UI for Blazor function with an expired license key?
 
 This depends on the [Telerik UI for Blazor license type (perpetual, subscription, or trial)](https://www.telerik.com/purchase/faq/licensing-purchasing#licensing):
 
@@ -93,44 +93,44 @@ Scenarios that do not match the above three descriptions result in the following
 * A watermark appears on Telerik UI for Blazor components.
 * [A warning message appears in the application's build log](slug:troubleshooting-license-key-errors).
 
-#### I updated the Telerik UI for Blazor version in my project and license errors appeared. Why?
+### I updated the Telerik UI for Blazor version in my project and license errors appeared. Why?
 
 The most likely cause is that the new Telerik UI for Blazor version was released after the expiration date of your current license or license key. To fix this issue:
 
 1. Renew your Telerik UI for Blazor license if necessary.
 1. [Update your license key](slug:installation-license-key)
 
-#### Can I use the same license key in multiple builds?
+### Can I use the same license key in multiple builds?
 
 You can use one license key in multiple pipelines, builds, and environments. However, each individual developer must use their own unique personal license key in their development environment.
 
-#### Do I need an Internet connection to activate the license?
+### Do I need an Internet connection to activate the license?
 
 No, the license validation and activation occur offline.
 
-#### Do I have to add the license key to source control?
+### Do I have to add the license key to source control?
 
 No, do not add the `telerik-license.txt` license key file or its contents to source control.
 
 Do not store the license key in plain text in GitHub Actions Workflow definitions. Build servers [must use the `TELERIK_LICENSE` environment variable](slug:deployment-license-key).
 
-#### What happens if both the environment variable and the license key file are present?
+### What happens if both the environment variable and the license key file are present?
 
 If both the `TELERIK_LICENSE` environment variable and the `telerik-license.txt` file are present, then the environment variable will be used.
 To use the license key file, unset the environment variable.
 
-#### What happens if several license key files exist?
+### What happens if several license key files exist?
 
 If both a global and a project-specific `telerik-license.txt` files exist, then the project-specific license key will be used.
 
-#### My team has more than one license holder. Which key do we have to use?
+### My team has more than one license holder. Which key do we have to use?
 
 To activate Telerik UI for Blazor:
 
 * [Every developer must be assigned their own license or seat](https://www.telerik.com/purchase/faq/licensing-purchasing).
 * Every developer must use a license key that is associated with their personal Telerik account.
 
-#### Are earlier Telerik UI for Blazor versions affected?
+### Are earlier Telerik UI for Blazor versions affected?
 
 No, versions up to **7.1.0** released prior to February 2025 do not require a license key.
 

troubleshooting/license-key-errors.md

@@ -25,44 +25,52 @@ A Telerik license key error may occur in the following scenarios:
 * Using an outdated license key after making renewals or purchases.
 * Using a license key that doesn't include Telerik UI for Blazor.
 * Using conflicting license keys in the same environment. For example, using one global license key and one in the app. Or, using a license key file together with an environment variable in CI/CD environment.
+* Corrupt license key
 
-Refer to the error messages below for specific tips.
+Refer to the specific error messages and tips below.
 
 ## Error Messages
 
-* [No license key is detected](#no-license-key-is-detected)
-* [Invalid license key](#invalid-license-key)
-* [Your subscription license has expired](#your-subscription-license-has-expired)
-* [Your perpetual license is invalid](#your-perpetual-license-is-invalid)
-* [Your trial license has expired](#your-trial-license-has-expired)
-* [Your license is not valid for the detected product(s)](#your-license-is-not-valid-for-the-detected-products)
+### No Telerik or Kendo UI product references detected in project (TKL001)
 
-### No license key is detected
+This error can occur when a project references `Telerik.Licensing`, but not any other Telerik packages. If your scenario is different, please contact [Technical Support](https://www.telerik.com/account/support-center).
+
+### No Telerik and Kendo UI License file found (TKL002)
 
 [Install a license key file](slug:installation-license-key). If you already downloaded it, make sure it's [saved at the right place](slug:installation-license-key#manual-installation).
 
-### Invalid license key
+### Corrupted Telerik and Kendo UI License Key content (TKL003)
+
+Follow the [automatic](slug:installation-license-key#automatic-installation) or [manual](slug:installation-license-key#manual-installation) installation steps from scratch. Also check how to [set up a license key in CI/CD environments](slug:deployment-license-key).
+
+If you have set a `TELERIK_LICENSE` environment variable through the Windows operating system's UI, then remove the environment variable and use a license key file instead.
+
+### Unable to locate licenses for all products (TKL004)
+
+Your license is not valid for the detected product(s).
+
+[Review the purchase options for Telerik UI for Blazor](https://www.telerik.com/purchase/blazor-ui). If you have already purchased the required license, then, [update your license key](slug:installation-license-key#license-key-updates).
 
-Follow the [automatic](slug:installation-license-key#automatic-installation) or [manual](slug:installation-license-key#manual-installation) installation steps from scratch.
+### Telerik UI for Blazor is not listed in your current license file (TKL101)
 
-### Your subscription license has expired
+Your license is not valid for the detected product(s).
 
-<a href="https://www.telerik.com/account/your-licenses" target="_blank">Renew your subscribtion</a>. Then, [update your license key](slug:installation-license-key#license-key-updates).
+[Review the purchase options for Telerik UI for Blazor](https://www.telerik.com/purchase/blazor-ui). If you have already purchased the required license, then, [update your license key](slug:installation-license-key#license-key-updates).
 
-### Your perpetual license is invalid
+### Your current license has expired (TKL102)
 
-You are using a product version released outside the validity period of your perpetual license. To remove the error message, do either of the following:
+This error applies to perpetual licenses. It means that you are using a product version released outside the validity period of your license. To remove the error message, do either of the following:
 
-* <a href="https://www.telerik.com/account/your-licenses" target="_blank">Renew your subscribtion</a>. Then, [update your license key](slug:installation-license-key#license-key-updates).
-* Downgrade your app to a Telerik UI for Blazor version that was released within the subscription period of your perpetual license.
+* [Renew your license](https://www.telerik.com/account/your-licenses) and then, [update your license key](slug:installation-license-key#license-key-updates).
+* Use a Telerik UI for Blazor version that was released within the subscription period of your perpetual license.
 
-### Your trial license has expired
+### Your subscription has expired (TKL103, TKL104)
 
-<a href="https://www.telerik.com/purchase/blazor-ui" target="_blank">Purchase a commercial license to continue using Telerik UI for Blazor</a>.
+This error applies to subscription licenses. [Renew your subscription](https://www.telerik.com/account/your-licenses) and then, [update your license key](slug:installation-license-key#license-key-updates).
 
-### Your license is not valid for the detected product(s)
+### Your trial expired (TKL105)
 
-<a href="https://www.telerik.com/purchase/blazor-ui" target="_blank">Review the purchase options for Telerik UI for Blazor</a>. Then, [update your license key](slug:installation-license-key#license-key-updates).
+[Purchase a commercial license to continue using Telerik UI for Blazor](https://www.telerik.com/purchase/blazor-ui).
 
 ## See Also