Polish error messages

Author: dimodi

troubleshooting/license-key-errors.md

@@ -18,42 +18,40 @@ This page provides solutions for license key errors that you may encounter while
 
 A Telerik license key error may occur in the following scenarios:
 
-* Missing license key.
-* Using an expired subscription license after the end of the subscription term.
-* Using a perpetual license with a product version that was released outside the validity period of your license.
-* Using an expired trial license.
-* Using an outdated license key after making renewals or purchases.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
+* The license key is missing or not set up correctly.
+* The license key is outdated or does not include the product version that you are using.
+* Your subscription license or trial has expired.
+* You have different 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.
 
 Refer to the specific error messages and tips below.
 
 ## Error Messages
 
 ### No Telerik or Kendo UI product references detected in project (TKL001)
 
-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).
+This error can occur when a project references `Telerik.Licensing`, but not any other Telerik packages. In this case, please remove the `Telerik.Licensing` package from the project. 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).
+The error means that the license key is missing or not set up corrently. For example, the environment variable is not set or [the license file may be at the wrong place](slug:installation-license-key#manual-installation).
+
+[Install a license key](slug:installation-license-key) again. Also check how to [set up a license key in CI/CD environments](slug:deployment-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).
+The license key is detected, but its value is invalid and cannot be decrypted. For example, if you have set a `TELERIK_LICENSE` environment variable through the Windows operating system's UI, then it may be truncated. In such cases, remove the environment variable and use a license key file instead.
 
-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.
+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).
 
 ### Unable to locate licenses for all products (TKL004)
 
-Your license is not valid for the detected product(s).
+Your license is not valid for the detected product(s), because it doesn't include them.
 
 [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).
 
 ### Telerik UI for Blazor is not listed in your current license file (TKL101)
 
-Your license is not valid for the detected product(s).
+Your license key does not include Telerik UI for Blazor.
 
 [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).