> For the complete documentation index, see [llms.txt](https://help.security.gallagher.com/knowledge-hub/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.security.gallagher.com/knowledge-hub/deployment-resources/support-tools-and-troubleshooting/upgrade-validation-tool.md).

# Upgrade Validation Tool

Check Command Centre upgrade compatibility before upgrading or migrating a server.

Run the Upgrade Validation Tool before any upgrade and well in advance. It is for customers upgrading to vEL8.20 or later. It evaluates compatibility by extracting the OS, SQL Server instance, and configured Controller customizations, and by checking for legacy Controllers and devices. Channel Partners can then fetch updated customizations from the File Transfer Site. Contact Technical Support if one is missing. Confirm the customer's OS and SQL meet the minimums.

Location: install media `Utilities\PreUpgradeValidationTool\`. It is also on the File Transfer Site. Run it on the existing server, and on the new server if migrating. Services do not need to be stopped. Provide an output directory and select **Validate**. 

Send the file to Technical Support if it reports errors, such as DLL incompatibilities or unsupported SQL. See the Technician Video Library for "Pre-Upgrade Validation Tool and Controller Upgrade Utility."

![Pre-Upgrade Validation Tool (System Validation) — Output Path field and the VALIDATE button](https://3862776825-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Feem9HLOjc53n2VxEz3Cq%2Fuploads%2FM3sx2u7ptpDMmSHv5lDB%2FSECHUB-iut-upgrade-validation-tool-01-system-validation-ui.png?alt=media\&token=47d1704c-0fef-4594-8d7e-fddcfc567042)

![System Validation complete — the System Diagnostics report showing Host name, Operating System (Supported: Yes), SQL Server (Supported: Yes) and Hardware Supported: Yes](https://3862776825-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Feem9HLOjc53n2VxEz3Cq%2Fuploads%2Ff5GRKSgm5u4MUEWymtXM%2FSECHUB-iut-upgrade-validation-tool-02-validation-complete-report.png?alt=media\&token=c55f815b-8451-42a0-bf2f-d5399439d93e)


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