By default, the version of SQL Express thats installed is the RTM version of 2017, so this needs updating to the latest version
As of December 2025 the latest is CU31 build 14.0.3515.1, which we can get here
For a list of all updates, Microsofts own KB is out of date listing the March 2025 release as the latest, however this site has a much more up to date list of all patches which is here
If we scroll down, we can see it in Method 3 for obtaining the release, and click Download The Package Now
Then click Download
Double click the exe
Accept the EULA and click Next
Click Next
Wait for the check and click Next
Click Update
When its done, click Close
The full guide can be found here
https://blog.leaha.co.uk/2025/12/23/veeam-data-platform-13-ultimate-deployment-guide/