UA Gateway prerequisites

After installing Kepware Version 7.1.236  on VM Server W2025 I get this error below about UA Gateway not installed

Date           Time               Level           Source                               Event
11/6/2026       9:06:13.018 AM    Error           UA Gateway                           Failed to install the UA Gateway service. System requirements are not satisfied.

Did I miss some pre-requisites ?

Second question : once properly installed, how can we use this OPC UA Gateway?  from which tool?

Best regards,