---
title: "Troubleshooting installation and licensing"
canonical: "https://help.vicon.com/space/Nexus215/11373887/Troubleshooting%20installation%20and%20licensing"
format: markdown
---
The following issues are known to exist when using VAULT and the Sentinel license manager.

| **Issue** | **Workaround** |
| --- | --- |
| If you uninstall the latest version (9.8) of the Sentinel License Manager and install an older version, none of your previously available network licenses are displayed. | If you need to use an older version of Sentinel License Manager:<br>1. C<span style="color: #404040">opy:</span>  
*<span style="color: #404040">C:\Program Files (x86)\Common Files\Thales\Sentinel RMS License Manager\WinNT\lservrc </span>*  
<span style="color: #404040">to </span>  
<span style="color: #404040">*C:\Program Files (x86)\Common Files\SafeNet Sentinel\Sentinel RMS License Manager\WinNT\lservrc *</span>
2. <span style="color: #404040">Either reboot the machine or stop and then restart the Sentinel RMS License Manager service.</span> |
| If you're using VAULT version 1.6 or later, versions of the license server earlier than 9.8 are not displayed in the **Available servers** list or in the 9.8 version of the WlmAdmin utility. | To specify a license server on your network, select **Use a Specific Network License Server**, enter the name in the **License Server** field, and click **OK**. |