We are wondering which version of FME Flow will support ArcGIS Enterprise 11.5. Looking on the history in Notes on FME and Esri Versions and Compatibility I would guess it might be 2025.1?
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Given ESRI haven’t made Enterprise 11.5 available to the general public, we might need to wait to FME 25.1 as you say https://support.esri.com/en-us/products/arcgis-enterprise/life-cycle
Aye we think alike 
But it would be nice if someone from Safe could say something about this. I understand 11.5 is not released yet but maybe there is some form of communication between ESRI and Safe about this.
We would like to upgrade Enterprise to 11.5 as that is a long term release. As these products are tied together (we can’t upgrade Enterprise without having upgraded FME Flow first) it would be nice to know if we can expect to upgrade to 2025.1 (summer) or need to wait until 2025.2 (fall).
Don’t know yet is a valid answer as well.
Aye we think alike But it would be nice if someone from Safe could say something about this. I understand 11.5 is not released yet but maybe there is some form of communication between ESRI and Safe about this.
We would like to upgrade Enterprise to 11.5 as that is a long term release. As these products are tied together (we can’t upgrade Enterprise without having upgraded FME Flow first) it would be nice to know if we can expect to upgrade to 2025.1 (summer) or need to wait until 2025.2 (fall).
Don’t know yet is a valid answer as well.
I recall reading somewhere that Safe don’t get any advanced access to Esri releases, so they have to wait for the public release before they can confirm compatibility. That may be wrong and/or it may have changed since I read it.