--- title: "How to Fix “Invalid License, Update Failed: Download failed. Unauthorized” Error?" url: https://nexterwp.com/docs/fix-invalid-license-update-failed-download-failed-unauthorized-error/ date: 2026-01-27 modified: 2026-04-14 author: "Aditya Sharma" description: "When updating a premium plugin in WordPress, especially paid ones like Nexter Blocks Pro or Nexter Extension Pro, you may encounter the error message “Invalid License, Update Failed: Download failed...." image: https://nexterwp.com/wp-content/uploads/2026/01/How-to-Fix-Invalid-License-Update-Failed-Download-failed-Unauthorized-Error-1024x538.jpg word_count: 805 --- # How to Fix “Invalid License, Update Failed: Download failed. Unauthorized” Error? ## Key Takeaways - Nexter Blocks Pro and Nexter Extension Pro may show an 'Invalid License, Update Failed' error due to license key issues. - Users must ensure they are using the latest version of Nexter Blocks Pro or Nexter Extension Pro to avoid activation errors. - Deactivating and reactivating the license key can resolve domain mismatch issues for Nexter products. - Server-side firewalls may block license validation requests, preventing activation of Nexter plugins. When updating a premium plugin in WordPress, especially paid ones like Nexter Blocks Pro or Nexter Extension Pro, you may encounter the error message “Invalid License, Update Failed: Download failed. Unauthorized,” It usually indicates a problem with your license key. Here’s a step-by-step guide to resolve it. ## How to Fix the “Invalid License Key” Error If you’re trying to activate your license key and encounter the **“Invalid License Key”** error, follow the steps below to troubleshoot and resolve the issue: ### 1. Ensure You’re Using the Latest Plugin Version Before proceeding, confirm that you’re running the latest version of the plugin you're facing the problem with, **Nexter Blocks Pro **or **Nexter Extension Pro**. **To check and update your version:** - Visit **[Nexter Changelog](https://roadmap.nexterwp.com/updates)** to verify the latest available version. - If your plugin is outdated and you’re unable to update it due to the license error, you may need to **manually update** the plugin. ### 2. Check and Re-Activate Your License Key Sometimes the error may occur due to a domain mismatch or old license records. **To resolve this:** - Go to your [**POSIMYTH Store Dashboard**](https://store.posimyth.com/)**.** - Locate your license key under the relevant product. - Click on the **“Manage Site”** button (above the license key). - **Deactivate** the domain currently using the license (if listed). - Return to your WordPress site and re-enter the license key to activate it again. ### 3. Check Your Server-Side Firewall and Security Rules Sometimes, the license validation or update request from your WordPress site can be blocked by your server’s firewall or security system. If the server firewall is blocking outgoing connections to the licensing updater server, you might see the error when trying to activate the license key. **To fix this**: - Ask your hosting provider or server admin to ensure that outgoing connections (especially to the licensing server) are allowed and not blocked by firewalls, mod_security rules, or other server-side security tools. If you’re still encountering the error after following the steps above, it could be due to one of the following common reasons: ## Reasons 1. There could be a domain mismatch i.e. the website from which you are trying to update the plugin is not connected with the plugin license. This can happen if you first install the plugin on a test site and then move it to the real site using the same license. Even though it might say the license is “**Activated**,” it’s actually deactivated in this situation.  2. Your plugin license could have expired. If your license has expired and you try to update it, you’ll see this message. 3. You might have entered the wrong license key for the plugin, which will prevent the plugin from updating. 4. Your plugin license might be inactive. If your license key isn’t active and you try to update the plugin, it won’t work. 5. If your WordPress uses an old version of OpenSSL or cURL, the plugin might not update properly because it can’t securely communicate with its server.  ## Solution ### Deactivate and Re-activate License Deactivate and reactivate the plugin license from your WordPress website; this will fix the domain mismatch issue. For Nexter Blocks or Nexter Extension plugin, follow the steps –   - From the Dashboard, go to **Nexter **> **Activate** **PRO**. - Click on the **Deactivate** button in the **Activation Key** section. - Then paste the license key again and click on the **Activate** button. If you are having any issues while activating the license, you can check the [common license activation issues](https://nexterwp.com/docs/how-to-activate-nexter/#Common-Licence-Activation-Issues). ### Manually Update You can manually update the plugin. For this, you have to follow the steps –   - Download the latest version of the plugin from the plugin website. - After that, you have to deactivate and delete the existing plugin (deleting the plugin generally will not delete the data from the database)  - Then upload and activate the plugin. For Nexter plugin, follow the steps –  1. Visit [POSIMYTH Store](https://store.posimyth.com/) and log in to your account. This is the same login details you used on the checkout page. 2. Click on the **Dashboard** link. 3. From the Dashboard, go to the **Downloads** section. You’ll see a list of plugins based on your purchases. Find **Nexter Blocks** or **Nexter Extension** (whichever you need) and click the **Download** button for the latest version. The plugin file will be downloaded to your system’s default download folder. ![](https://nexterwp.com/wp-content/uploads/2026/01/nexter-blocks-download-store-version-1024x576.png) 4. Next, open your **WordPress Dashboard** and go to **Plugins**. Deactivate and delete the existing version of **Nexter Blocks** or **Nexter Extension Pro**, whichever plugin you are using. Don’t worry, deleting the plugin will not delete your data. 5. Click on the **Add New Plugin** > **Upload Plugin**. Then click **Choose File** and upload your plugin, then click **Install** **Now**. ![](https://nexterwp.com/wp-content/uploads/2026/01/nexter-blocks-install-new-plugin-1024x384.png) 6. Once the plugin is installed, on the next page, click on **Activate** **Plugin**. ![](https://nexterwp.com/wp-content/uploads/2026/01/nexter-blocks-install-activate-plugin.png) If the issue persists, feel free to reach our [helpdesk](https://store.posimyth.com/helpdesk/). Our team will help you in every possible way. ## Frequently Asked Questions **Q: What should I do if I still see the 'Invalid License' error after re-activating my license key?** A: If the error persists, it could be due to your server's firewall blocking outgoing connections to the licensing server. Contact your hosting provider to ensure that outgoing connections are allowed and not blocked by security tools. This is crucial because if the server cannot communicate with the licensing updater, the activation will fail. **Q: How can I manually update Nexter Blocks or Nexter Extension if I can't resolve the license error?** A: To manually update, download the latest version of the plugin from the POSIMYTH Store, then deactivate and delete the existing plugin from your WordPress dashboard. After that, upload the new version and activate it. This method ensures you have the latest features and fixes, even if the license issue isn't resolved immediately. **Q: What common reasons might cause the 'Invalid License' error?** A: Common reasons for this error include domain mismatches, expired licenses, incorrect license keys, or inactive licenses. If your website is not connected to the license, it may show as activated but won't function properly. Understanding these reasons can help you troubleshoot effectively. **Q: Are there any best practices for managing my license key for Nexter products?** A: Regularly check that your license key is active and correctly associated with your domain. If you change domains or move your site, deactivate the license on the old domain first. This practice helps prevent domain mismatch issues and ensures smooth updates for Nexter Blocks and Nexter Extension. **Q: Can I use Nexter Blocks Pro or Nexter Extension Pro without a valid license?** A: No, both Nexter Blocks Pro and Nexter Extension Pro require a valid license for updates and support. Without a valid license, you may encounter errors like 'Invalid License, Update Failed: Download failed. Unauthorized' when trying to update the plugins. Keeping your license active is essential for maintaining functionality. **Q: What steps should I take if my plugin version is outdated due to a license error?** A: First, verify that you are using the latest version of the plugin by checking the Nexter Changelog. If you're unable to update due to the license error, you may need to manually update the plugin. Download the latest version from the POSIMYTH Store, deactivate the existing plugin, and then upload the new version to ensure you have the latest features.